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|---|---|---|
President Obama announces tonight the end of the United States' combat mission in Iraq.. | 0non-cybersec
| Reddit |
Hello? Hello. OHHHH! BANANA!. | 0non-cybersec
| Reddit |
Good but cheap cast iron skillet? . My aluminium & teflon pans suck, but I can't afford Creuset or anything. [Wal-Mart](http://www.walmart.com/catalog/product.do?product_id=5969628&sourceid=44444444440173849059) has a line of cheap cast iron from the Lodge, is it any good?
Otherwise, what are reasonably priced options for a cast iron frying pan?
edit: Hey I just wanted to thank everyone for their great replies! It'll be a few months before we're in garage sale-ing weather, so it looks like I'll stop by the Salvation Army and Goodwill, and if those come up empty, these Lodge pans look like a great value. Thanks, all!
Next up, a good stock pot! My current pots aren't big enough for a proper tortilla soup! | 0non-cybersec
| Reddit |
$\lim_{x\to c} f(x)=L$. <p>With regard to the question:<a href="https://math.stackexchange.com/questions/2170054/lim-x-to-a-fx-lim-x-to-a-fx-l">$\lim_{x\to a^{-}} f(x) =\lim_{x\to a^{+}} f(x) =L$</a></p>
<blockquote>
<p><strong>theorem</strong> :Suppose that $f : A \to \mathbb{R}$, where$ A ⊆ \mathbb{R}$, and $c \in \mathbb{R} $ is an accumulation point of $\{ x\in A : x > c\}$
and $ c$ is not an accumulation point $\{ x\in A : x < c\}$ Then: </p>
<p>$$\lim_{x\to c} f(x)=L$$</p>
<p>if and only if :</p>
<p>$$\lim_{x\to c^+} f(x)=L$$</p>
</blockquote>
<p>is the theorem correct ?
if correct . prove .</p>
| 0non-cybersec
| Stackexchange |
Issues with time sync with remote PC and robot. <p>Has anyone come across this error before?</p>
<pre><code>[ WARN] [1587458925.300460191]: Failed to compute laser pose, aborting initialization (Lookup would require extrapolation into the future. Requested time 1587458925.315650008 but the latest data is at time 1587458925.289327081, when looking up transform from frame [odom] to frame [base_footprint])
</code></pre>
<p>I have seen a lot of threads similarly related but most suggest to sync both the time on the PC and robot using NTP and Chrony, which I have done on numerous occasions.</p>
<p>I am Using Ubuntu16.04 and working with the Turtlebot3 waffle_pi version.</p>
<p>I was thinking I could maybe adjust the timing tolerance? But I am actually unsure on how to do this and if it will completely resolve the issue.</p>
<p>Just on another note, I am using dual boot with Windows and have noticed that after I use Ubuntu and then start up Windows, the time is always incorrect (1 hour behind). I have manually adjusted this and automatically using time sync on Windows, but the issue still persists once I restart the system.</p>
<p>I found that Linux gets it's time from BIOS assuming it is UTC while Windows does it assuming it is your regional time, so I found a solution on this forum:
<a href="https://answers.microsoft.com/en-us/windows/forum/windows_10-other_settings/windows-10-time-always-wrong/75d9036d-9f43-4a06-9c34-ec9bdc8f4fd7" rel="nofollow noreferrer">https://answers.microsoft.com/en-us/windows/forum/windows_10-other_settings/windows-10-time-always-wrong/75d9036d-9f43-4a06-9c34-ec9bdc8f4fd7</a></p>
<p>But when I go to edit this in <code>gedit /etc/default/rcS</code> I cannot find anything relating to UTC and I cannot save any changes as I am not root.</p>
<p>Any advice would be very helpful.</p>
| 0non-cybersec
| Stackexchange |
Increase Video Streaming speed on Windows Media Player in Windows 10. | 0non-cybersec
| Reddit |
How to use spot instance with amazon elastic beanstalk?. <p>I have one infra that use amazon elastic beanstalk to deploy my application.
I need to scale my app adding some spot instances that EB do not support.</p>
<p>So I create a second autoscaling from a launch configuration with spot instances.
The autoscaling use the same load balancer created by beanstalk.</p>
<p>To up instances with the last version of my app, I copy the user data from the original launch configuration (created with beanstalk) to the launch configuration with spot instances (created by me).</p>
<p>This work fine, but:</p>
<ol>
<li><p>how to update spot instances that have come up from the second autoscaling when the beanstalk update instances managed by him with a new version of the app?</p>
</li>
<li><p>is there another way so easy as, and elegant, to use spot instances and enjoy the benefits of beanstalk?</p>
</li>
</ol>
<p><strong>UPDATE</strong></p>
<p>Elastic Beanstalk add support to spot instance since 2019... see:
<a href="https://docs.aws.amazon.com/elasticbeanstalk/latest/relnotes/release-2019-11-25-spot.html" rel="nofollow noreferrer">https://docs.aws.amazon.com/elasticbeanstalk/latest/relnotes/release-2019-11-25-spot.html</a></p>
| 0non-cybersec
| Stackexchange |
What do kings like to do at the strip club?. Make it reign | 0non-cybersec
| Reddit |
How to allow just one site to use PHP's exec() function. <p>I have a simple Apache with mod_php server on CentOS 7. I've disabled the exec function in php.ini but I need to use it on one Vhost. Now obviously I know I can't use multiple php.ini files and I know I can't change the disable_functions setting outside of the php.ini file, so I tried toying with other ideas.</p>
<p>Obviously my first option was to use fastcgi, or suPHP, etc. but I couldn't get them to work without breaking the server, and whilst I probably could eventually make them work, I'd rather find a different solution and stick with the simple mod_php.</p>
<p>My second thought was to install Nginx and php-fpm and get it to listen on another port, but despite setting disable_functions to an empty value, it still read the php.ini file as well and thus disabled the php_exec function.</p>
<p>So is there a relatively simple way of achieving this without having to reset up Apache with fastcgi?</p>
| 0non-cybersec
| Stackexchange |
Blursed Walkout. | 0non-cybersec
| Reddit |
Trump Just Cited This Crazypants “News” Report Narrated by a Russian-Accented Computer. | 0non-cybersec
| Reddit |
A police officer catching his partner sleeping on the job. | 0non-cybersec
| Reddit |
Trying to Set up Web Server in CentOS on HyperV - FTP Not Working. <h1>Background</h1>
<p>I am not a Linux or really even a command line person, but I've been tasked with setting up a Linux server for a company intranet.</p>
<p>I've set up a CentOS 7 installation in HyperV on Windows 10. I then got the AMP stack set up inside, and I got internet from the network passing through Win10 into CentOS. And I got the CentOS web server have it's own IP address and be accessible from the outside network.</p>
<p>I am now trying to get FTP working, so that when I move the VM to it's eventual real server, which isn't on my desktop, I can move files to it via FTP. I have followed numerous tutorials centered on <code>vsftp</code>. I have installed it, I have added FTP access to <code>firewall-cmd</code>. I have messed with <code>iptables</code>, and then found out that apparently CentOS uses <code>firewalld</code>, not <code>iptables</code>?</p>
<h1>Settings</h1>
<p>In <code>/etc/vsftp/vsftp.conf</code>:</p>
<pre><code>anonymous_enable=NO
local_enable=YES
write_enable=YES
local_umask=022
dirmessage_enable=YES
xferlog_enable=YES
connect_from_port_20=YES
xferlog_file=/var/log/xferlog
xferlog_std_format=YES
chroot_local_user=YES
allow_writeable_chroot=YES
listen=NO
listen_ipv6=YES
pam_service_name=vsftpd
userlist_enable=YES
tcp_wrappers=YES
userlist_deny=NO
userlist_file=/etc/vsftpd.userlist
</code></pre>
<p>The contents of <code>/etc/vsftpd.userlist</code>:</p>
<pre><code>tester
</code></pre>
<p>Status of <code>vsftpd</code>:</p>
<p><a href="https://i.stack.imgur.com/mFQlH.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/mFQlH.png" alt="enter image description here" /></a></p>
<h1>Problem</h1>
<p>When I try to connect via FTP, I see:</p>
<p><a href="https://i.stack.imgur.com/7qIAW.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/7qIAW.png" alt="enter image description here" /></a></p>
<h1>Question</h1>
<p>What am I doing wrong?</p>
| 0non-cybersec
| Stackexchange |
Trump friend says president considering firing Mueller. | 0non-cybersec
| Reddit |
Confused about the two extra buttons on the Cyborg R.A.T. 5. <p>I got a RAT 5 today and it's working fine now. But there are two extra buttons I'm a little confused about. One is the one which switches profiles, and the other is by the scroll wheel and says "DPI" on it.</p>
<p>1) Is there an easier way to see which mode you're in? The mode switch button is positioned such that my eyes don't meet it, and I have to move my head right over the mouse to see it. There are lights on the underside of that button, which I can see perfectly well; what do these mean? And is there a way to get them to reflect the mode you're in?</p>
<p>2) What does the DPI button do? I can't seem to figure it out.</p>
| 0non-cybersec
| Stackexchange |
Derivative where x=a. <p>If $f(x)=x^3+3x+2$</p>
<p>Find the number(s) a such that the tangent lines to the graphs of $f(x)$ and $f'(x)$ at $x=a$ are the same.</p>
<p>So far I have come up with:</p>
<p>$f'(x)=3(x^2+1)$</p>
<p>And when I graph both these functions out on my calculator the only point I am finding where $x=a$ is at $1$ (which could be incorrect as it is hard to tell exact points using only graphs).</p>
<p>First is this correct? and second is there a better way of coming to that conclusion rather than graphing it?</p>
| 0non-cybersec
| Stackexchange |
A Bitcoin entrepreneur under house arrest was able to attend a Chicago Bitcoin conference through remote control over a robot.. | 0non-cybersec
| Reddit |
How do I use amsrefs to enter editors’ names in the standard format?. <p>I have a question about <code>amsrefs</code> that is in addition to the one that I already asked <a href="https://tex.stackexchange.com/questions/210776/how-do-i-get-amsrefs-to-include-the-publisher-s-name-in-a-cross-reference">here</a> and that was answered. I would like to know how to enter editors’ names using <code>amsrefs</code>.</p>
<p>Specifically, I would like to have the following format:</p>
<blockquote>
<p>Name of article’s author, title of article, title of conference proceedings book in which the article appears, <strong>name of first editor</strong> and <strong>name of second editor</strong> (Eds.), name of publisher, address of publisher, year of publication, page numbers.</p>
</blockquote>
<p>I know that using <code>\BibSpec</code>, I have some control over information fields:</p>
<pre><code>\BibSpec{collection.article}{%
+{} {\PrintAuthors} {author}
+{,} { \textit} {title}
+{.} { } {part}
+{:} { \textit} {subtitle}
+{,} { \PrintContributions} {contribution}
+{,} { \PrintConference} {conference}
+{} {\PrintBook} {book}
+{,} { } {booktitle}
+{,} { } {publisher}
+{,} { \PrintDateB} {date}
+{,} { pp.~} {pages}
+{,} { } {status}
+{,} { \PrintDOI} {doi}
+{,} { available at \eprint} {eprint}
+{} { \parenthesize} {language}
+{} { \PrintTranslation} {translation}
+{;} { \PrintReprint} {reprint}
+{.} { } {note}
+{.} {} {transition}
+{} {\SentenceSpace \PrintReviews} {review}
}
</code></pre>
<p>However, due to the lack of online references, I do not know how to use <code>\BibSpec</code> to display editors’ names as indicated above, especially how to include the phrase “(Eds.)” without making it appear twice if I have to enter the names of two editors.</p>
<p>Thank you very much for your help!</p>
| 0non-cybersec
| Stackexchange |
Alaba freekick goal against Braunschweig. | 0non-cybersec
| Reddit |
Caption and footnote width with ctable. <p>I am using <code>ctable</code> and I have a table with footnotes. Since the table is narrow, the caption text is squeezed in the table width, which looks odd. I can use <code>mincapwidth</code> to specify a minimum width for the table environment (not the table itself) which solves this issue, but creates another: it also applies to the footnote, which looks ugly since the footnote is small. Is there a way to make the footnote obey the width of the table itself and ignore <code>mincapwidth</code>?</p>
<p>Example:</p>
<pre><code>\ctable[
caption = {Somewhat long long long caption which is long},
mincapwidth = \textwidth,
]{lr}{
\tnote[a]{Short footnote}
}{
\toprule
Header 1 & Header 2 \\
\midrule
foo\tmark[a] & 1 \\
\bottomrule
}
</code></pre>
<p>Which looks like this</p>
<p><img src="https://i.stack.imgur.com/KhS7e.png" alt="End result"></p>
| 0non-cybersec
| Stackexchange |
How to install php-gtk?. <p>I can't find it in the repositories.I am using Maverick.</p>
| 0non-cybersec
| Stackexchange |
Definition of cusp form in $L^2$ and convergence over $N_{\mathbb Q} \backslash N_{\mathbb A}$. <p>Let <span class="math-container">$G$</span> be an adjoint semisimple group over <span class="math-container">$\mathbb Q$</span> with parabolic subgroup <span class="math-container">$P = MN$</span> in good position relative to a compact subgroup <span class="math-container">$U= \prod\limits_v K_v$</span> of <span class="math-container">$G(\mathbb A)$</span>. Let <span class="math-container">$L$</span> be the space of square integrable functions on <span class="math-container">$G(\mathbb Q) \backslash G(\mathbb A)$</span> which are invariant on the right by <span class="math-container">$U$</span>. In <em>Euler Products</em>, Langlands defines a cusp form in <span class="math-container">$L$</span> to be an element <span class="math-container">$\phi$</span> satisfying</p>
<p><span class="math-container">$$\int\limits_{N(\mathbb Q) \backslash N(\mathbb A)} \phi(ng)dn = 0\tag{1}$$</span></p>
<p>for almost all <span class="math-container">$g \in G(\mathbb A)$</span>. However, it is not clear to me why the left hand side converges at all. All we know is that </p>
<p><span class="math-container">$$\int\limits_{G(\mathbb Q) \backslash G(\mathbb A)} |\phi(g)|^2 dg < \infty$$</span>
Using the Iwasawa decomposition, we can write <span class="math-container">$G(\mathbb A) = N(\mathbb A)M(\mathbb A)K$</span>, so that, at least formally,</p>
<p><span class="math-container">$$\int\limits_{G(\mathbb A)} \phi(g)dg = \int\limits_{M(\mathbb A)} \int\limits_{N(\mathbb A)} \int\limits_K \phi(nmk) \delta_P(m) dk dm dn = \operatorname{vol}(K)\int\limits_{M(\mathbb A)} \int\limits_{N(\mathbb A)}\phi(nm) \delta_P(m)dndm$$</span></p>
<p>One can probably finagle from here something like:</p>
<p><span class="math-container">$$\int\limits_{G(\mathbb Q) \backslash G(\mathbb A)}|\phi(g)|^2 dg = \operatorname{vol}(K)\int\limits_{M(\mathbb Q)\backslash M(\mathbb A)} \int\limits_{N(\mathbb Q) \backslash N(\mathbb A)} |\phi(nm)|^2 \delta_P(m)dn dm$$</span></p>
<p>from which we should have</p>
<p><span class="math-container">$$\int\limits_{N(\mathbb Q) \backslash N(\mathbb A)} |\phi(ng)|^2 dn < \infty$$</span>
for almost all <span class="math-container">$g \in G$</span>. However, this says nothing about the convergence of <span class="math-container">$n \mapsto \phi(ng)$</span>, only of <span class="math-container">$n \mapsto |\phi(ng)|^2$</span>.</p>
| 0non-cybersec
| Stackexchange |
To the non-smokers, would you date a smoker?. I know this is hypocritical but I don't object to weed just cigarettes. Anyway, I met this great guy. Perfect in every way and we hit it off but he smokes. I told him that I don't like smoking and he said he'd (eventually) give it up (we've heard that before).
Anyway, he texted me tonight and I didn't answer because I really don't want to hurt his feelings and I don't want a smoker in my life. | 0non-cybersec
| Reddit |
Such add. Many confuse. Wow. (xpost /r/fellowkids). | 0non-cybersec
| Reddit |
iPhone 11 Pro Max camera cover?. I just upgraded to the newest iPhone and I’ve had it for a while but I’ve been very paranoid about scratching or damaging the phone in general. I have a case and a tempered glass for the screen but now I’m afraid that I’m gonna damage my cameras (I had a scratch on my last phones camera and I don’t want that to happen again) Does anyone have a good way to protect the cameras? I’ve seen the tempered glass covers on amazon but I’m worried it’ll mess up the camera quality :( | 0non-cybersec
| Reddit |
Doggo thinks he a B U N N Y B O Y E. | 0non-cybersec
| Reddit |
Anyone remember Seven Days? I love time travel stories and this was one that IMO was done pretty well.. | 0non-cybersec
| Reddit |
Question about memory handling of trees and certain sorts on large data sets.. <p>If data structures such as trees and certain sorts(quick sort, merge sort) work using recursive algorithms and recursive algorithms take up a lot of memory space in the stack and can only work on a limited data sets(if not it'll lead to stackoverflow), then how come trees and the aforementioned sorts used practically to handle large data sets. Wouldn't it lead to stackoverflow? </p>
| 0non-cybersec
| Stackexchange |
Shall I use guard clause, and try to avoid else clause?. <p>I've read (e.g. from Martin Fowler) that we should use guard clause instead of single return in a (short) method in OOP. I've also read (from somewhere I don't remember) that else clause should be avoided when possible.</p>
<p>But my colleagues (I work in a small team with only 3 guys) force me not to use multiple returns in a method, and to use else clause as much as possible, even if there is only one comment line in the else block.</p>
<p>This makes it difficult for me to follow their coding style, because for example, I cannot view all code of a method in one screen. And when I code, I have to write guard clause first, and then try to convert it into the form with out multiple returns.</p>
<p>Am I wrong or what should I do with it?</p>
| 0non-cybersec
| Stackexchange |
How do I increase significant digits in Grapher?. <p>How do I increase the significant digits in Grapher? </p>
| 0non-cybersec
| Stackexchange |
SAHPs—how do you structure your days to actually get the chores done? And how do you avoid becoming helicopter mom/dad??. Hey y’all! Thanks in advance for the advice.
My son is 1 and I stay home full time and am a wedding photographer as well so I need to find ways to better build “work time” in. However I am STRUGGLING to keep up with chores. My house stays pretty tidy in the living areas but bedrooms and my office are generally always a disaster zone. I cook almost 100% of our meals due to my son’s severe food allergies, but that doesn’t bother me because I actually love to cook (see username). I’m having the hardest time coming up with routines to keep up with laundry, cleaning, work, and being present with my son. My husband is working full time as an RN and is in grad school to be an FNP full time so right now it is not feasible for him to split the chores with me to help. He jumps in when he can as much as he can but at this point in time all he can manage is being the trash guy and being the dog poop in the yard guy.
The second half of this—I am definitely right on the edge of making my entire life about my son. I’m trying to catch myself early so that I don’t establish an unhealthy parenting pattern that I somehow normalize to myself and later can’t break out of and it hurts him overall. Currently, though, he’s super into the fact that during his awake hours I am like...100% involved in everything he’s doing and focused on him. I don’t want to not be focusing on him a ton but also I have created a bit of an attention monster. If “bob” (we say mommy, he exclusively calls me bob) isn’t paying attention to him at all times he’s crying, which he doesn’t do for anyone else. Even babysitters, he will play by himself happily and they always comment that he didn’t cry at all for them. For me, though, it’s 24/7. If I’m playing with him he’s chatting away and laughing and pausing to come over and hug me, but if I have to pee or be cooking something or clean a mess (vomit, spills, the stuff that can’t wait until naptime) he’s soooo mad. HELP. How can I reverse this pattern before I get so wrapped up in him there’s no going back??? I actually LOVE playing with him so it’s not even about the crying bothering me, although currently I have a ruptured eardrum and dang that whining sound HURTS the bad ear, but mostly that I don’t want to miss anything while he’s this little and I want to remember playing with him more than chores.
HELP. I need more structure for sure but I also need to be less hover-y before I’m Beverly Goldberg or worse 😂 | 0non-cybersec
| Reddit |
A kitty actually enjoys its time in a bathtub?. | 0non-cybersec
| Reddit |
Looking for some insight on a prospective college course. Hello,
I’m interested in hearing some of your guys’ feedback about a program at a local college.
Here is the link (http://www.sait.ca/programs-and-courses/full-time-studies/diplomas/information-systems-security) if ya have any extra time to look through what it offers, and give some feedback on whether or not this is a wise course to take in order to get into the security field.
Thanks for any feedback you could give me! | 1cybersec
| Reddit |
Diagonalization of a matrix by a basis. <blockquote>
<p>Corollary. Let $A$ be a complex unitary matrix. Then there exista a unitary matrix $U$ such that $U^{-1}AU$ is a diagonal matrix.</p>
</blockquote>
<p>Proof. Let $\{e_1,...e_n\}=\mathscr{B}$ be the standard orthonormal baisis of $\mathbb{C}^2$, and let $\{w_1,...,w_n\}=\mathscr{B}´$ be an orthonormal basis which diagonalizes A, viewed as a linear map of $\mathbb{C}^n$ into itself. Let</p>
<p>$U=M^\mathscr{B´}_\mathscr{B}(id)$.</p>
<p>Then $U$ is unitary, and if $M´$ is the matrix of $A$ relative to the basis $\mathscr{B}´$, then </p>
<p>$M´=U^{-1}AU$.</p>
<p>It follows that $M´$ is unitary. <strong><em>Linear Algebra, Serge Lang</em></strong></p>
<p><strong>Question</strong>:</p>
<p>Ihave been trying to understand this proof but I do not know how the author states "$\{w_1,...,w_n\}=\mathscr{B}´$ be an orthonormal basis which diagonalizes A". I have been investigating this issue but unsuccessfully I have not find clear examples of a diagonalization of a matrix by a basis. What does it mean?</p>
<p>Thanks in advance</p>
| 0non-cybersec
| Stackexchange |
TIL on January 22, 1943, the temperature in Spearfish, South Dakota, changed from -4°F to 45°F in just two minutes, setting a world record. This was caused by a Chinook wind, which increased the temperature eventually up to 54°F before dying down, dropping the temperature back to -4°F.. | 0non-cybersec
| Reddit |
Failed to connect to the host via ssh: Host key verification failed.\r\n. <p>Getting error when i try to connect to hosts in ansible</p>
<p>I am able to ping ssh_connection in local host (ansible), but not in jenkins pipeline build.</p>
<p>I have tried almost everything.</p>
<pre><code>----------
[FPipeline] Running shell script
+ ansible all -m ping -vvv
ansible 2.4.0.0
config file = /var/lib/jenkins/workspace/FPipeline/ansible.cfg
configured module search path =
[u'/var/lib/jenkins/.ansible/plugins/modules',
u'/usr/share/ansible/plugins/modules']
ansible python module location = /usr/lib/python2.7/site-packages/ansible
executable location = /bin/ansible
python version = 2.7.5 (default, Aug 4 2017, 00:39:18) [GCC 4.8.5 20150623
(Red Hat 4.8.5-16)]
Using /var/lib/jenkins/workspace/FPipeline/ansible.cfg as config file
Parsed /etc/ansible/hosts inventory source with ini plugin
META: ran handlers
Using module file /usr/lib/python2.7/site-
packages/ansible/modules/system/ping.py
<localhost> ESTABLISH SSH CONNECTION FOR USER: None
<localhost> SSH: EXEC ssh -C -o ControlMaster=auto -o ControlPersist=60s -o
KbdInteractiveAuthentication=no -o PreferredAuthentications=gssapi-with-
mic,gssapi-keyex,hostbased,publickey -o PasswordAuthentication=no -o
ConnectTimeout=10 -o ControlPath=/var/lib/jenkins/.ansible/cp/8a5a4c6a60
localhost '/bin/sh -c '"'"'echo ~ && sleep 0'"'"''
Using module file /usr/lib/python2.7/site-
packages/ansible/modules/system/ping.py
<192.168.219.131> ESTABLISH SSH CONNECTION FOR USER: None
<192.168.219.131> SSH: EXEC ssh -C -o ControlMaster=auto -o
ControlPersist=60s -o KbdInteractiveAuthentication=no -o
PreferredAuthentications=gssapi-with-mic,gssapi-keyex,hostbased,publickey -o
PasswordAuthentication=no -o ConnectTimeout=10 -o
ControlPath=/var/lib/jenkins/.ansible/cp/81147ff3f7 192.168.219.131 '/bin/sh
-c '"'"'echo ~ && sleep 0'"'"''
<192.168.219.131> (255, '', 'Host key verification failed.\r\n')
server1 | UNREACHABLE! => {
"changed": false,
"msg": "Failed to connect to the host via ssh: Host key verification
failed.\r\n",
"unreachable": true
}
<localhost> (255, '', 'Host key verification failed.\r\n')
localhost | UNREACHABLE! => {
"changed": false,
"msg": "Failed to connect to the host via ssh: Host key verification
failed.\r\n",
"unreachable": true
}
----------
</code></pre>
<p>Can you please help me regarding this...</p>
| 0non-cybersec
| Stackexchange |
How to differentiate integrals with variable limits?. <p>I'd like to evaluate the following two derivatives.
$$
(1) \frac{d}{d\theta^*} \int_{\theta^{*}}^1x^{\theta}\theta^\alpha g(\theta)d\theta
$$
$$
(2) \frac{d}{dx} \int_{\theta^{*}}^1x^{\theta}\theta^\alpha g(\theta)d\theta
$$
Thank you for your time.</p>
| 0non-cybersec
| Stackexchange |
How to use spot instance with amazon elastic beanstalk?. <p>I have one infra that use amazon elastic beanstalk to deploy my application.
I need to scale my app adding some spot instances that EB do not support.</p>
<p>So I create a second autoscaling from a launch configuration with spot instances.
The autoscaling use the same load balancer created by beanstalk.</p>
<p>To up instances with the last version of my app, I copy the user data from the original launch configuration (created with beanstalk) to the launch configuration with spot instances (created by me).</p>
<p>This work fine, but:</p>
<ol>
<li><p>how to update spot instances that have come up from the second autoscaling when the beanstalk update instances managed by him with a new version of the app?</p>
</li>
<li><p>is there another way so easy as, and elegant, to use spot instances and enjoy the benefits of beanstalk?</p>
</li>
</ol>
<p><strong>UPDATE</strong></p>
<p>Elastic Beanstalk add support to spot instance since 2019... see:
<a href="https://docs.aws.amazon.com/elasticbeanstalk/latest/relnotes/release-2019-11-25-spot.html" rel="nofollow noreferrer">https://docs.aws.amazon.com/elasticbeanstalk/latest/relnotes/release-2019-11-25-spot.html</a></p>
| 0non-cybersec
| Stackexchange |
"showframe", how to make colored lines of page layout?. <p>In my answers here, on TeX.SS many times I like to show tables with width of <code>\textwidth</code> together with page layout. Since both lines are black, it is not simple distinguish table vertical border lines and table top line from page layout. If the page layout lines be in for example blue, this would become more easier. </p>
<p>An example:</p>
<p><a href="https://i.stack.imgur.com/xC7WQ.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/xC7WQ.png" alt="enter image description here"></a></p>
<p>Above image is done by</p>
<pre><code>\documentclass{article}
\usepackage{showframe}
\usepackage{array, booktabs}
\begin{document}
\scriptsize
\centering
\setlength\tabcolsep{0pt}
\begin{tabular*}{\textwidth}{@{\,}m{2cm}@{\extracolsep{\fill}}*{18}{c}@{\,}}
\toprule
& \multicolumn{17}{c}{APE Thresholds (\%)} &
\\ \cmidrule(lr){2-18}
\centering Model
& 0.01 & 0.05 & 0.1 & 0.25 & 0.5 & 1 & 2 & 5
& 7.5 & 10 & 15 & 30 & 40 & 50 & 75 & 100
& None & Best \\ \midrule
Closed
& 25 & 50 & 35 & 40 & 45 & & &
& & & & & & & &
& & \\ \bottomrule
\end{tabular*}
\end{document}
</code></pre>
| 0non-cybersec
| Stackexchange |
Installing bluetooth manager without a keyboard. <p>I'm trying to connect a non-dongle bluetooth keyboard to a rasberry pi but I don't have a regular keyboard to set it up. Just a mouse.</p>
<p>I have a script to install the bluetooth manager which i can transfer over from a thumb drive but no way to execute it. Is there a script to execute commands?</p>
| 0non-cybersec
| Stackexchange |
How to use spot instance with amazon elastic beanstalk?. <p>I have one infra that use amazon elastic beanstalk to deploy my application.
I need to scale my app adding some spot instances that EB do not support.</p>
<p>So I create a second autoscaling from a launch configuration with spot instances.
The autoscaling use the same load balancer created by beanstalk.</p>
<p>To up instances with the last version of my app, I copy the user data from the original launch configuration (created with beanstalk) to the launch configuration with spot instances (created by me).</p>
<p>This work fine, but:</p>
<ol>
<li><p>how to update spot instances that have come up from the second autoscaling when the beanstalk update instances managed by him with a new version of the app?</p>
</li>
<li><p>is there another way so easy as, and elegant, to use spot instances and enjoy the benefits of beanstalk?</p>
</li>
</ol>
<p><strong>UPDATE</strong></p>
<p>Elastic Beanstalk add support to spot instance since 2019... see:
<a href="https://docs.aws.amazon.com/elasticbeanstalk/latest/relnotes/release-2019-11-25-spot.html" rel="nofollow noreferrer">https://docs.aws.amazon.com/elasticbeanstalk/latest/relnotes/release-2019-11-25-spot.html</a></p>
| 0non-cybersec
| Stackexchange |
Server access through two different wifi routers. <p>I have a wifi home-network setup. I have a linux server, and couple of linux devices, but most of the others in my home use windows computers.</p>
<p>My 'use case' seems simple enough to me, but may require explanation. I have two wifi-routers, thus two wifi networks.</p>
<p>wifi-1 (wifi router #1) is my standard connection. wifi-2 (wifi router #2) is used for VPN connection.</p>
<p>Right now, wifi-2 (internal ip = 192.168.1.1) is the only wireless device connected to my server. I want to also connect wifi-1 (internal ip = 192.168.0.1) to the server. <strong>How do I do this?</strong></p>
<p>-- Additional info --</p>
<p>Also, I am NOT seeking to "port forward" either router as I want to keep the two different routers distinct. Some media-streaming services (hulu, netflix) do not allow the use of a VPN connection so I want to be able to choose which wireless network I connect to, but still want access to the home server from both.
Another reason I want server access from either device is for network-printing. Wireless printers can only connect to one wireless network. I want my printers managed by the server and accessible whether I am on wifi-1 or wifi-2.
Lastly, not sure if this is necessary info, but one of my routers (wifi-1) is actually a modem/router combo. So for internet access I have only the two devices. Router #2 is plugged into my server via ethernet cable. Router #2 is also plugged into one of the out ports on Router #1.</p>
<p>INTERNET FEED ---> ROUTER #1 <-----> ROUTER #2 ---> SERVER </p>
| 0non-cybersec
| Stackexchange |
Steel jet can't melt beams of fuel. | 0non-cybersec
| Reddit |
Proving Recursive Functions are Representable in R. <p>I am trying to prove that all recursive functions are representable in the theory $R$ whose language is $L$ and whose theorems are the consequences in $L$ of the following infinitely many sentences:</p>
<ol>
<li>$\mathbf{i}\ne\mathbf{j}$ for all $i,j$ such that $i\ne j$</li>
<li>$\mathbf{i}+\mathbf{j}=\mathbf{k}$ for all $i,j,k$ such that $i+j=k$</li>
<li>$\mathbf{i}\cdot\mathbf{j}=\mathbf{k}$ for all $i,j,k$ such that $i\cdot j=k$</li>
<li>$\forall x(x<\mathbf{i}\to x=\mathbf{0}\lor\dots\lor x=\mathbf{i-1})$ for all $i$</li>
<li>$\forall x(x<\mathbf{i}\lor x=\mathbf{i}\lor\mathbf{i}<x)$ for all $i$</li>
</ol>
<p>I am having trouble proving minimization, composition, successor, projection, addition and multiplication.</p>
<p>I attempted to prove the theorems using Boolos' model of proof from $Q$ but I quickly got stuck, since the proof of representability using $Q$ in Boolos uses axioms $R$ doesn't have. The notes I am using can be found <a href="http://tedsider.org/teaching/510/notes.pdf" rel="nofollow">here</a> starting on page 94.</p>
| 0non-cybersec
| Stackexchange |
Some help with connections and voltage arrow in CircuitikZ. <p>Good evening,</p>
<p>in the following drawing I added two diodes on the secondary side.
Three questions:</p>
<ol>
<li>As you can see, I placed D1 first and went from there to D2, inverting D3. I did the same starting from the transformer with the lower part. How do I know connect the transformer terminal B2 to the wire between D3 and D4?</li>
<li>My added voltage arrow is not placed very well. It needs to go on the right with a little space added. Also it needs to be clear, that it points from the node c1 to node c2. Is there a way to improve this?</li>
</ol>
<p>Thank you very much.</p>
<p><a href="https://i.stack.imgur.com/IigAj.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/IigAj.png" alt="enter image description here"></a></p>
<pre><code> \documentclass{article} \usepackage[utf8]{inputenc} \usepackage[siunitx,european,fetbodydiode,smartlabels]{circuitikz} \usetikzlibrary{positioning} \begin{document}
\begin{figure} % Generalized diagram of different components inside an AC drive with voltage intermediate circuit % Based on a template by % Author: Erno Pentzin (2013), http://www.texample.net/tikz/examples/ac-drive-components/
\begin{circuitikz}
\draw
% top part of switch legs
(0,0) coordinate[label=above:s1] (s1)
to ++ (0,-0.4)
node (mosfet1) [nigfete,below,anchor=D] {$Q_1$}
(mosfet1) node (mosfet3) [nigfete,right=22mm] {$Q_3$}
(mosfet1.S) to [short,-*] ++ (0,-0.4) coordinate[label=above:t1] (t1)
% transformer (t1 -| mosfet3.S) % Connect Q1 with Q3S which is electrically wrong, but easier to draw
node (T) [transformer core,below right=0mm and 11mm]{}
% bottom part of switch legs
(mosfet3.S |- T.A2) coordinate (t2) % likewase counter intuitive
to ++ (0,-0.4)
node (mosfet4) [nigfete,below,anchor=D] {$Q_4$}
(t1 |- mosfet4.D) node (mosfet2) [nigfete,below,anchor=D] {$Q_2$}
% connection lines origins at transformer
(T.A1) to (t1)
(T.A2) to [short,-*] (t2)
(T.B1) to [short,-o] ++ (0.5,0) coordinate (t3)
(T.B2) to [short,-o] ++ (0.5,0) coordinate (t4)
(t3) to[open, v^=$v_o(t)$] (t4)
% connection lines orign at mosfet
(t1) to (mosfet2.D)
(mosfet2.S) to ++ (0,-0.4) coordinate[label=below:s2] (s2)
(mosfet3.D) to ++ (0, 0.4) coordinate[label=above:s3] (s3)
(mosfet3.S) to (mosfet4.D)
(mosfet4.S) to ++ (0,-0.4) coordinate (s4)
% supply lines
(s3) -- (s1) to [short,*-o] ++ (-2,0) coordinate (s+) % added *-o, * to get dot at S1
(s4) -- (s2) to [short,*-o] ++ (-2,0) coordinate (s-) % added *-o, * to get dot at S2
(s+) to [open, v=60<\volt>, invert] (s-)
% secondary side
(t3) to [Do,name=d1,label=D1] ++(0,1.5) --++(1.5,0) coordinate[label=above:c1] (c1)
(c1) to [Do,invert,name=d3,label=$D3$] ++(0,-1.5)
(t4) to [Do,invert,name=d2,label=D2] ++(0,-1.5) --++(1.5,0) coordinate[label=below:c2] (c2)
(c2) to [Do,name=d4,label=D4] ++(0,1.5) -- (d3)
(d2) -- (d1)
(t4) -- (d4)
(c1) to [open, v=60<\volt>, invert] (c2)
;
\end{circuitikz}
\caption[Ersatzschaltbild]{Ersatzschaltbild}
\label{fig:ersatzschaltbild}
\end{figure}
\end{document}
</code></pre>
| 0non-cybersec
| Stackexchange |
5 Best New TV Seasons on Netflix 2014. | 0non-cybersec
| Reddit |
Colorboxes that break across pages. <p>I am trying to build an environment/command that allows me to place comments in the text. The idea is to have colored box that can break across pages and use the <code>\ttfamily</code> font with hyphenation. I also want to use any structure (table, enumerate, itemize, etc.) inside it. Moreover the box width is variable and the maximum is <code>\linewidth</code>. My MWE is below.</p>
<pre><code>\documentclass{article}
\usepackage{blindtext}
\usepackage[showframe]{geometry}
\usepackage{xcolor}
\usepackage{calc}
\usepackage{mdframed}
\usepackage{environ,varwidth}
\newsavebox\MyTempBox
\NewEnviron{mycomment}{%
\savebox\MyTempBox{%
\begin{varwidth}{\linewidth}
\BODY
\end{varwidth}}%
\begin{mdframed}
[topline=false,
rightline=false,
bottomline=false,
leftline=false,
innerleftmargin=1ex,
innerrightmargin=1ex,
innertopmargin=1ex,
innerbottommargin=1ex,
backgroundcolor=pink,
font=\ttfamily,
userdefinedwidth=\dimexpr\wd\MyTempBox\relax
]
\hyphenchar\font=\defaulthyphenchar\relax
\BODY
\end{mdframed}%
}%
\begin{document}
\begin{mycomment}
\blindtext
\blindtext
\blindtext
\blindtext
\blindtext
\blindtext
\end{mycomment}
\end{document}
</code></pre>
<p>So far it almost works, the problem is that it generates a lot of <code>Overfull \hbox</code> because the text does strictly not respect the box boundaries. If I put the second <code>\BODY</code> inside a minipage</p>
<pre><code>\begin{minipage}{\linewidth}
\BODY
\end{minipage}
</code></pre>
<p>It works better, but I loose the break over pages feature. I think that a minipage that can break over pages can be the solution.</p>
<p>I am not attached to the mdframed package. For example,</p>
<pre><code>\newcommand{\ccomment}[1]{%
\noindent\colorbox{pink}{\begin{varwidth}{\linewidth-1em}%
\ttfamily
\hyphenchar\font=\defaulthyphenchar\relax % enable hyphenation
#1
\end{varwidth}}}
</code></pre>
<p>Would be ok for me, but once more I cannot use it for long text that may break across pages.</p>
<p>Thanks. </p>
| 0non-cybersec
| Stackexchange |
press f to pay respek. | 0non-cybersec
| Reddit |
Grandmother demanding time. My mother has expectations that our young (3 yr, 4 mo) kids spend a lot of time with family, but for a lot of reasons it's very difficult for us to get out of the house (wife disabled, demanding career, etc), meaning we miss a lot of family gatherings. It's way more convenient for people to come to us, but it never happens. Today I had to cancel plans to bring my oldest over there to play, because he's sick, and she's giving me the guilt trip over it. I get regular phone calls about how we need to make spending time with family a priority, but we're doing all we can. Is anyone else in a similar situation? Am I being selfish not going through the work to get my kids around to see their family?
The big one: has anyone else instituted a policy whereby visits need to happen where the kids live, rather than the relatives? Is this okay to do? | 0non-cybersec
| Reddit |
How to use spot instance with amazon elastic beanstalk?. <p>I have one infra that use amazon elastic beanstalk to deploy my application.
I need to scale my app adding some spot instances that EB do not support.</p>
<p>So I create a second autoscaling from a launch configuration with spot instances.
The autoscaling use the same load balancer created by beanstalk.</p>
<p>To up instances with the last version of my app, I copy the user data from the original launch configuration (created with beanstalk) to the launch configuration with spot instances (created by me).</p>
<p>This work fine, but:</p>
<ol>
<li><p>how to update spot instances that have come up from the second autoscaling when the beanstalk update instances managed by him with a new version of the app?</p>
</li>
<li><p>is there another way so easy as, and elegant, to use spot instances and enjoy the benefits of beanstalk?</p>
</li>
</ol>
<p><strong>UPDATE</strong></p>
<p>Elastic Beanstalk add support to spot instance since 2019... see:
<a href="https://docs.aws.amazon.com/elasticbeanstalk/latest/relnotes/release-2019-11-25-spot.html" rel="nofollow noreferrer">https://docs.aws.amazon.com/elasticbeanstalk/latest/relnotes/release-2019-11-25-spot.html</a></p>
| 0non-cybersec
| Stackexchange |
Write column header on multiple line. <blockquote>
<p><strong>Possible Duplicate:</strong><br>
<a href="https://tex.stackexchange.com/questions/2441/how-to-add-a-forced-line-break-inside-a-table-cell">How to add a forced line break inside a table cell</a> </p>
</blockquote>
<p>I would like to write the header of a column on multiple line. I tried with this commands but it doesn't work:</p>
<pre><code>\begin{tabular}{|c|l|l|l|l|l|l|}
\hline \\
$\alpha$
& \multicolumn{1}{|c|}{GallusGallus \\ CC \\ t = 104}
& \multicolumn{1}{|c|}{GallusGallus \\ MF \\ t = 124}
& \multicolumn{1}{|c|}{GallusGallus \\ BP \\ t = 110}
& \multicolumn{1}{|c|}{BosTaurus \\ CC \\ t = 99}
& \multicolumn{1}{|c|}{BosTaurus \\ MF \\ t = 217}
& \multicolumn{1}{|c|}{BosTaurus \\ BP \\ t = 205}
\end{tabular}
</code></pre>
<p>How can I fix?</p>
| 0non-cybersec
| Stackexchange |
Shmoocon 2011 Crypto Challenge Pack. | 1cybersec
| Reddit |
Quick! Someone call life alert!. | 0non-cybersec
| Reddit |
"It's ya boy!!". | 0non-cybersec
| Reddit |
Integrated camera on Dell XPS-15-9570. <p>Recently the camera stopped working on my Dell XPS-15-9570. I am fairly confident it used to work well, but stopped on 20.04 LTS. Is there a way to make it functional again?</p>
| 0non-cybersec
| Stackexchange |
Kobe Un-follows His Teammates on Twitter. | 0non-cybersec
| Reddit |
What is one thing everyone should put in their car?. | 0non-cybersec
| Reddit |
I was born and raised in Brazil and always dreamed of telling stories to a global audience. I've been writing and Kickstarting projects (films, comics, TV) ever since 2012 to audiences worldwide. AMA!. Back in 2011 I had to leave California after a Master's degree in Film to go back to my home country Brazil. Instead of responsibly falling back on Advertising like most film making graduates do over there I set out to pursue my dream of making a living as a storyteller. I set out to write and direct my very first feature film for less than $10K while adapting a feature length screenplay into a graphic novel to be released two years later. I crowdfunded both projects. I was determined to find myself my own global audience no matter what.
​
Almost eight years later, and over 20 successful crowdfunding campaigns in both Brazil and the US, I found a passionate fan base that follows my work whether it's comics, film or my latest project - a board game. Ask me anything about making comics, writing for Film and TV, being an entrepreneur, a PR enthusiast, a passionate storyteller, a Brazilian Churrasco master chef and a determined fool that dreams for a living.
​
Proof that I'm here: [https://truepic.com/5fq6auff](https://truepic.com/5fq6auff)
Link to my latest comic book on Kickstarter funded in an hour: [https://www.kickstarter.com/projects/felipecagno/the-few-and-cursed-6-season-finale?ref=904s33](https://www.kickstarter.com/projects/felipecagno/the-few-and-cursed-6-season-finale?ref=904s33)
Link to the Board Game based on my comics: [https://www.kickstarter.com/projects/mikegnade/the-few-and-cursed-board-game?ref=dw9mfq](https://www.kickstarter.com/projects/mikegnade/the-few-and-cursed-board-game?ref=dw9mfq)
​
THANKS FOR THE QUESTIONS! | 0non-cybersec
| Reddit |
Reason for four frame types in Wireless LAN. <p>So I was asked this question in an interview as a junior network specialist the other day:</p>
<blockquote>
<p>Give A reason why there is only one frame type in a wired LAN but four
frame types in a wireless LAN.</p>
</blockquote>
<p>This was my answer:</p>
<blockquote>
<p>The reason for having only one frame type in a wired LAN is due to the
fact that they are self-identifying. Due to this reason they are able
to intermix various protocols while using the same physical network
and makes it possible to allow a single sender to utilize various
protocols together and still transmit the data over the medium.</p>
</blockquote>
<p>But for wireless LAN my brain went numb, but was I saying the right thing?</p>
| 0non-cybersec
| Stackexchange |
Should I take over a compromised website from another hacker?. <p>A website (www.blue*****art.com) is trying to attack my server using the <a href="https://en.wikipedia.org/wiki/Shellshock_%28software_bug%29">Shellshock vulnerability</a>. After doing an <a href="http://en.wikipedia.org/wiki/Nmap">Nmap</a> scan on the attacking IP address, I found many open ports. It looks like the website is running <a href="https://en.wikipedia.org/wiki/Exim">Exim</a>, which is vulnerable to <a href="http://www.techradar.com/us/news/software/security-software/all-you-need-to-know-about-the-ghost-vulnerability-1282919?src=rss&attr=all">GHOST</a>.</p>
<p>The website in question has not been maintained for the past three years (from copyright date, Twitter and Facebook status); possibly the owner passed away. A check with Sucuri shows that it is currently not blacklisted, because no malware has been found.</p>
<p>Should I retaliate by taking over the website from the hacker and shutting it down to stop it from scanning other people's computers? </p>
| 0non-cybersec
| Stackexchange |
Umano Android SlidingUpPanel - animation. <p>I am using the following project: <a href="https://github.com/umano/AndroidSlidingUpPanel" rel="noreferrer">https://github.com/umano/AndroidSlidingUpPanel</a></p>
<p>It works very nicely so far, but I have one issue: I want to hide the slidable panel until I press a button, then the panel should be faded in, with an animation; currently the panel is shown when the button is pressed, but without an animation, and I don't know how to implement said animation.</p>
<p>Any ideas would be very much welcome!</p>
| 0non-cybersec
| Stackexchange |
arXiv:math/9309213v1 [math.CA] 28 Sep 1993
ar
X
iv
:m
at
h/
93
09
21
3v
1
[
m
at
h.
C
A
]
2
8
S
ep
1
99
3
Uniform multi-parameter limit transitions in the Askey tableau
Tom H. Koornwinder
Extended abstract for the Proceedings of the Conference “Modern developments in complex analysis and
related topics” (on the occasion of the 70th birthday of prof. dr. J. Korevaar), University of Amsterdam,
January 27–29, 1993.
1. Elementary limit formulas
We consider the classical orthogonal polynomials as monic polynomials pn(x) = x
n+ terms
of degree less than n. We have
• Jacobi polynomials p
(α,β)
n (x) with respect to weight function (1 − x)
α (1 + x)β on
(−1, 1);
• Laguerre polynomials ℓαn(x) with respect to weight function e
−x xα on (0,∞);
• Hermite polynomials hn(x) with respect to weight function e
−x2 on (−∞,∞).
Note that, for α → ∞, the rescaled Jacobi weight function (1−x2/α)α on (−α
1
2 , α
1
2 ) tends
to the Hermite weight function e−x
2
on (−∞,∞). Accordingly we have the limit formula
lim
α→∞
αn/2p(α,α)n (x/α
1
2 ) = hn(x).
Also, for β → ∞, the rescaled Jacobi weight function xα (1− x/β)β on (0, β) tends to the
Laguerre weight function xαe−x on (0,∞). Accordingly we have the limit formula
lim
β→∞
(−β/2)n p(α,β)n (1− 2x/β) = ℓ
α
n(x).
This can be graphically indicated in the (α, β)-parameter plane extended with the lines
{(α, β) | α = ∞, −1 < β ≤ ∞} and {(α, β) | −1 < α ≤ ∞, β = ∞}. When we start with
a point (α, α) then we can draw a diagonal arrow to the (Hermite) point (∞,∞) and a
vertical arrow to the (Laguerre) point (α,∞).
The celebrated Favard theorem states that {pn}n=0,1,2,... is a system of monic orthogo-
nal polynomials with respect to a positive orthogonality measure if and only if a recurrence
relation
x pn(x) = pn+1(x) +Bn pn(x) + Cn pn−1(x), n = 1, 2, . . . , (1.1)
x p0(x) = p1(x) +B0 p0(x),
p0(x) = 1,
is valid with Cn > 0 and Bn real. Below, when we will give this recurrence relation with
explicit coefficients then we will silently assume that the case n = 0 has the same analytic
form as the case n > 0, but with the term Cn pn−1(x) omitted.
If the coefficients Bn and Cn are given then pn is completely determined by this recur-
rence relation. In particular, if Bn and Cn would continuously depend on some parameter
http://arxiv.org/abs/math/9309213v1
–2–
λ then pn(x) will also continuously depend on λ. For example, Hermite polynomials satisfy
the recurrence relation
xhn(x) = hn+1(x) +
1
2
nhn−1(x). (1.2)
Now consider rescaled Laguerre polynomials
pn(x) = pn(x;α, ρ, σ) := ρ
n ℓαn(ρ
−1x− σ).
From the well-known recurrence relation for Laguerre polynomials we find for these rescaled
polynomials:
x pn(x) = pn+1(x)− ρ (2n+ α+ 1 + σ) pn(x) + ρ
2 n (n+ α) pn−1(x). (1.3)
We would like to make the rescaling in such a way that, as α → ∞, pn(x) will tend to
hn(x). It is easy to see how to do this when we compare (1.2) and (1.3). Put ρ := (2α)
−
1
2 ,
σ := −α. Then (1.3) becomes
pn+1(x)− (2α)
−
1
2 (2n+ 1) pn(x) +
n (n+ α)
2α
pn−1(x).
The recurrence coefficients now tend to 0 resp. 1
2
n as α → ∞. Hence pn(x) → hn(x) as
α → ∞, i.e.,
lim
α→∞
(2α)−
1
2
n ℓαn((2α)
1
2 x+ α) = hn(x).
Thus, in the extended (α, β)-parameter plane we can also start at a Laguerre point
(α,∞) and draw a horizontal arrow to the Hermite point (∞,∞).
2. Uniform limit of Jacobi polynomials
It is now natural to conjecture that we might also make these limit transitions in the param-
eter plane in a more uniform way, i.e., to make such a rescaling of the Jacobi polynomials
that they depend continuously on (α, β) in the extended parameter plane and reduce to
(possibly rescaled) Laguerre and Hermite polynomials on the boundary lines and bound-
ary vertex at infinity, respectively. For this purpose we consider Jacobi polynomials with
arbitrary rescaling:
pn(x) := ρ
n p(α,β)n (ρ
−1x− σ). (2.1)
These polynomials satisfy recurrence relations (1.1) with
Cn :=ρ
2 4n (n+ α) (n+ β) (n+ α+ β)
(2n+ α+ β − 1) (2n+ α+ β)2 (2n+ α + β + 1)
=
ρ2 αβ (α+ β)
(α+ β)4
×
4n (1 + n/α) (1 + n/β) (1 + n/(α+ β))
(1 + (2n− 1)/(α+ β)) (1 + 2n/(α+ β))2 (1 + (2n+ 1)/(α+ β))
(2.2)
and
Bn :=ρ
( β2 − α2
(2n+ α+ β) (2n+ α+ β + 2)
+ σ
)
=ρ
(β − α
β + α
1
1 + 2n/(α+ β)
1
1 + (2n+ 2)/(α+ β)
+ σ
)
. (2.3)
–3–
From (2.2) we see that the choice
ρ :=
(α+ β)
3
2
α
1
2 β
1
2
(2.4)
makes Cn continuous on (α, β) in the extended parameter plane. Next we see from (2.3)
that the choice
σ :=
α− β
α+ β
(2.5)
makes Bn continuous in (α, β) (extended) as well. Indeed, we can now rewrite
Bn =
β−1 − α−1
(α−1 + β−1)
1
2
4n+ 2 + 4n (n+ 1)/(α+ β)
(1 + 2n/(α+ β)) (1 + (2n+ 2)/(α+ β))
,
which is continuous in (α−1, β−1) for α−1, β−1 ≥ 0.
As a result we can consider the (α−1, β−1)-parameter plane. For α−1, β−1 > 0 we
have the rescaled Jacobi polynomials (2.1) with ρ and σ given by (2.4) and (2.5). These
polynomials extend continously to the closure {(α−1, β−1) | α−1, β−1 ≥ 0}. On the bound-
ary lines {(α−1, 0) | α−1 > 0} and {(0, β−1) | β−1 > 0} these polynomials become rescaled
Laguerre polynomials. On the boundary vertex (0, 0) the polynomials become Hermite
polynomials.
3. Uniform limits in the Askey tableau
The Askey tableau is given by the following chart (cf. Askey & Wilson [1, Appendix]).
Wilson Racah
↓ ց ւ ց
cont. dual Hahn cont. Hahn Hahn dual Hahn
↓ ւ ↓ ւ ↓ ց ւ ↓
ւ ց
Meixner-Pollaczek Jacobi Meixner Krawtchouk
ց ↓ ւ ց ւ
Laguerre Charlier
ց ւ
Hermite
The various families of orthogonal polynomials mentioned here are all of classical type,
i.e., the orthogonal polynomials {pn}n=0,1,... satisfy an equation of the form
Lpn = λn pn,
where L is some second operator (differential or difference) which does not depend on n.
The arrows in the chart mean limit transitions between the various families. The number
of additional parameters on which the polynomials depend, decreases as we go further
–4–
down in the chart. In the top row there are 4 parameters. In each subsequent row there
is one parameter less. The Hermite polynomials in the bottom row no longer depend
on parameters. The families in the left part of the chart consist of polynomials being
orthogonal with respect to an absolutely continuous measure, while the ones in the right
part are orthogonal with respect to a discrete measure. In the case of Racah, Hahn, dual
Hahn and Krawtchouk polynomials the support of the measure has finite cardinality, say
N + 1, and we consider only polynomials up to degree N .
All the polynomials in this chart have explicit expressions as hypergeometric functions.
For instance, Jacobi polynomials are given by
P (α,β)n (x) = const. 2F1
[
−n, n+ α+ β + 1
α+ 1
; x
]
.
Hahn polynomials are given by
Qn(x;α, β,N) := 3F2
[
−n, n+ α+ β + 1,−x
α+ 1,−N
; 1
]
, n = 0, 1, . . . , N,
while they satisfy orthogonality relations
N
∑
x=0
Qn(x)Qm(x)
(α+ 1)x (β + 1)N−x
x! (N − x)!
= 0, n 6= m.
Racah polynomials are given by
Rn(x(x+ γ + δ + 1);α, β, γ, δ) = 4F3
[
−n, n+ α+ β + 1,−x, x+ γ + δ + 1
α+ 1, β + δ + 1, γ + 1
; 1
]
,
where γ + 1 = −N and n = 0, 1, . . . , N .
Now consider monic Racah polynomials
rn(x;α, β,−N − 1, δ) := const. Rn(x;α, β,−N − 1, δ) = x
n + · · ·
and rescaled monic Racah polynomials
pn(x) := ρ
n rn(ρ
−1x− σ;α, β,−N − 1, δ). (3.1)
Then the pn(x) satisfy recurrence relations (1.1) with
Cn = ρ
2 n (n+ α) (n+ β) (n+ α + β) (n+ β + δ)
×
(δ − α − n) (n+N + α + β + 1) (N + 1− n)
(2n+ α+ β − 1) (2n+ α+ β)2 (2n+ α + β + 1)
, (3.2)
Bn = ρ
((n+ α + β + 1) (n+ α+ 1) (n+ β + δ + 1) (N − n)
(2n+ α + β + 1) (2n+ α+ β + 2)
+
n (n+ β) (δ − α − n) (n+N + α+ β + 1)
(2n+ α+ β) (2n+ α+ β + 1)
+ σ
)
. (3.3)
–5–
Now we would like to express ρ and σ in such a way in terms of α, β, δ and N that
the polynomials pn(x) in (3.1) continuously depend on these parameters up to boundaries
at infinity in the four-parameter plane, and such that Hahn polynomials and all families
which can be reached from the Hahn polynomials in the Askey tableau, are obtained as
polynomials pn(x) with parameters on the boundary. This is a task analogous to what we
did in section 2, but much more complicated. Again, formula (3.2) for Cn should suggest
a choice for ρ and next formula (3.3) for Bn should lead to the choice of σ. Thus we arrive
at
ρ :=
( (α+ β)3
αβ (β + δ) (N + α+ β) (δ − α)N
)
1
2
, (3.4)
σ := −
N (α+ 1) (β + δ + 1)
α+ β + 2
. (3.5)
Now turn from parameters α, β, δ, N to parameters α, b, d, ν by the substitution
β = bα, δ = (bdν + 1)α, N = b ν. (3.6)
Then we can prove the following theorem. Computations for this are somewhat tedious.
Some of them I performed with the help of Maple V.
Theorem The rescaled monic Racah polynomials pn(x) given by (3.1), with (3.4), (3.5)
and (3.6) being substituted, are continuous in (α−1, b−1, d−1, ν−1) for α−1, b−1, d−1, ν−1 ≥
0. When we restrict to any of the lower dimensional boundaries than we obtain rescaled
versions of other polynomials in the Askey tableau, as given below.
dimension specialization orthogonal polynomial family
4 Racah
3 d = ∞ Hahn
3 ν = ∞ Jacobi
3 b = ∞ Meixner
3 α = ∞ Krawtchouk
2 d, ν = ∞ Jacobi
2 d, b = ∞ Meixner
2 d, α = ∞ Krawtchouk
2 ν, b = ∞ Laguerre
2 ν, α = ∞ Hermite
2 b, α = ∞ Charlier
1 d, ν, b = ∞ Laguerre
1 d, b, α = ∞ Charlier
1 d, ν, α = ∞ Hermite
1 ν, b, α = ∞ Hermite
0 ν, b, d, α = ∞ Hermite
–6–
It is probably possible to formulate an anlogous theorem with Hahn polynomials being
replaced by dual Hahn polynomials. We should start then with a different part of four-
parameter space for the Racah polynomials. For Wilson polynomials we can start with
three different regions in four-parameter space. For each of these three cases there are
different limits in the Askey tableau (cf. [2, Table 4]). We can hope that for each of
these three cases a result analogous to the above theorem will hold. A further possible
extension might involve q as a fifth parameter. One might also try to include the limits to
non-polynomial special functions like Bessel functions and Jacobi functions (cf. [2]).
References
[1] R. Askey & J. Wilson, Some basic hypergeometric orthogonal polynomials that gen-
eralize Jacobi polynomials, Memoirs Amer. Math. Soc. 54 (1985), no. 319.
[2] T. H. Koornwinder, Group theoretic interpretations of Askey’s scheme of hypergeo-
metric orthogonal polynomials, in Orthogonal polynomials and their applications, M.
Alfaro, J. S. Dehesa, F. J. Marcellan, J. L. Rubio de Francia & J. Vinuesa (eds.),
Lecture Notes in Math. 1329, Springer, 1988, pp. 46–72.
University of Amsterdam, Faculty of Mathematics and Computer Science
Plantage Muidergracht 24, 1018 TV Amsterdam, The Netherlands
email [email protected]
| 0non-cybersec
| arXiv |
Gronk seen at Universal Studios wearing shirt that says "Sorry for Partying". | 0non-cybersec
| Reddit |
This is one of my favourite looks i've ever did. | 0non-cybersec
| Reddit |
Study the uniform convergence of $\cos^nx\sin^{2n}x$. <blockquote>
<p>Study the uniform convergence of $f_n(x)=\cos^nx\sin^{2n}x$ on $\mathbb{R}$</p>
</blockquote>
<p>My attempt:</p>
<p>Obviuosly $f_n(x)$ converges pointwise to $0,$ so I would like to proof uniform convergence to $0.$</p>
<p>I calculated the derivative $f_n(x):$ $n\cos^{n-1}(x)\sin^{2n-1}(x)(3\cos^2(x)-1)$</p>
<p>It's roots are: $0,\frac{\pi}{2},\arccos(\frac{1}{\sqrt{3}})$</p>
<p>$\arccos(\frac{1}{\sqrt{3}})$ turns out to be maxima point, placing it in $f_n,$ by <a href="https://www.wolframalpha.com/input/?i=cos%5En(arccos(1%2Fsqrt(3)))(sin(arccos(1%2Fsqrt(3)))%5E(2n)" rel="nofollow noreferrer">WolframAlpha</a> we get $2^n3^{-3n/2}\rightarrow0$ as $n\to \infty$.</p>
<p>Therefore $f_n(x) \xrightarrow{u}0.$ </p>
<hr>
<p>My questions are:</p>
<p>$1)$ How that result was obtained by WolframAlpha?</p>
<p>$2)$ Is there a simpler way to prove it, such as bounding from above by something that converges to $0?$</p>
<p>Any help appreciated.</p>
| 0non-cybersec
| Stackexchange |
Instagram on Android. Let's put Edit and Delete right next to each other.. | 0non-cybersec
| Reddit |
starting smartcard programming. <p>How could one get started with smartcards programming? I am asking here about all the toolkit he needs in order to get started: books, tutorials, hardware etc.</p>
<p>I am planning in playing around with a couple of smartcards programmers and I am pretty new to this field.</p>
<p><b>Edit:</b> I am mostly interested in programmers that play nice with Unix-like operating systems. Also, I am not sure how this works ... but I would like to program them in C/C++</p>
| 0non-cybersec
| Stackexchange |
Xiaomi says it crossed $1 billion in revenue in India during 2016. | 0non-cybersec
| Reddit |
Dimension too large when changing y axis mode. <p>I am using tikz to plot a figure in x-y plane, however when I change the y axis mod to logarithmic scale, I face to an error "Dimension too large". I searched in this website, but there were the same errors for other actions not with mine.
Any help?</p>
<pre><code>\begin{tikzpicture}
\begin{axis}[%
width=7.607cm,
height=7cm,
at={(0cm,0cm)},
scale only axis,
xmin=10,
xmax=40,
xlabel={EbNo (dB)},
xmajorgrids,
ymode=log,
ymin=0.99,
ymax=1,
yminorticks=true,
ylabel={Probability},
ymajorgrids,
yminorgrids,
axis background/.style={fill=white},
legend style={at={(0.688,0.157)},anchor=south west,legend cell align=left,align=left,draw=white!15!black,font=\scriptsize}
]
\addplot [color=blue,solid,mark=asterisk,mark options={solid}]
table[row sep=crcr]{%
40 0.998700013\\
38 0.99866668\\
36 0.99866668\\
34 0.998633347\\
32 0.998633347\\
30 0.998566681\\
28 0.998466682\\
26 0.998433349\\
24 0.99833335\\
22 0.998200018\\
20 0.997966687\\
18 0.997233361\\
16 0.996500035\\
14 0.99500005\\
12 0.991966747\\
10 0.984600152\\
8 0.969133622000001\\
6 0.938833844\\
4 0.872634182999999\\
2 0.757800972000009\\
};
\addlegendentry{var 3/64};
\addplot [color=red,solid,mark=triangle,mark options={solid,rotate=90}]
table[row sep=crcr]{%
40 0.998166685\\
38 0.998166685\\
36 0.998166685\\
34 0.998166685\\
32 0.998166685\\
30 0.998166685\\
28 0.998166685\\
26 0.998133352\\
24 0.998100019\\
22 0.997933354\\
20 0.997633357\\
18 0.997200028\\
16 0.996533368\\
14 0.994833384\\
12 0.992300075\\
10 0.984833477\\
8 0.971600263\\
6 0.941933826\\
4 0.880234148999998\\
2 0.763934322000008\\
};
\addlegendentry{fix 3/64};
\end{axis}
\end{tikzpicture}
</code></pre>
| 0non-cybersec
| Stackexchange |
Extra thiccc. | 0non-cybersec
| Reddit |
Would you ever date a woman who was heavier than you? If not, why?. | 0non-cybersec
| Reddit |
I don't think I gave you the right number :(. We met on New Years Eve, and you were my New Years Eve kiss. We hung out for a while after that and I realised you were a gorgeous guy. I was a little tipsy and I'm kind of a clumsy person anyway. So when you asked me for my number, which is new and I can't always remember it yet, I'm not sure if I typed it in right into your phone. Either that or you're deciding not to contact me and I'm being too eager for a response...I've just come out of a long relationship and I don't know how to deal with this kind of thing. Argh. | 0non-cybersec
| Reddit |
Found another use for my Seedling Heat Mat. | 0non-cybersec
| Reddit |
The big brain Dad. | 0non-cybersec
| Reddit |
On the integral $\int_{0}^{\pi/2} \frac{x \log \left ( 1-\sin x \right )}{\sin x} \, \mathrm{d}x$. <p>Recently I run into this integral</p>
<p>$$\mathcal{J} = \int_{0}^{\pi/2} \frac{x \log \left ( 1-\sin x \right )}{\sin x} \, \mathrm{d}x$$</p>
<p>I don't know to what it evaluates. I tried several approaches.</p>
<p><strong>1st:</strong> Differentiation under the integral sign</p>
<p>Consider the function $\displaystyle f(\alpha)= \int_{0}^{\pi/2} \frac{x \log \left ( 1-\alpha\sin x \right )}{\sin x} \, \mathrm{d}x$. Hence</p>
<p>\begin{align*}
\frac{\mathrm{d} }{\mathrm{d} \alpha} f(\alpha) &= \frac{\mathrm{d} }{\mathrm{d} \alpha} \int_{0}^{\pi/2} \frac{x \log \left ( 1-\alpha\sin x \right )}{\sin x} \, \mathrm{d}x \\
&= \int_{0}^{\pi/2} \frac{\partial }{\partial \alpha} \frac{x \log \left ( 1-\alpha\sin x \right )}{\sin x} \, \mathrm{d}x \\
&= -\int_{0}^{\pi/2} \frac{x \sin x}{\sin x \left ( 1- \alpha \sin x \right )} \, \mathrm{d}x\\
&=- \int_{0}^{\pi/2} \frac{x}{1- \alpha \sin x} \, \mathrm{d}x
\end{align*}</p>
<p>And the last integral equals? </p>
<p><strong>2nd:</strong> Taylor series expansion</p>
<p><em>Lemma:</em> It holds that</p>
<p>$$x \sin^n x = \left\{\begin{matrix}
2^{1-n}\displaystyle\mathop{\sum}\limits_{k=0}^{\frac{n-1}{2}}(-1)^{\frac{n-1}{2}-k}\binom{n}{k}\,x\sin\big((n-2k)x\big) & , & n \;\; \text{odd} \\\\
2^{-n}\displaystyle\binom{n}{\frac{n}{2}}\,x+2^{1-n}\mathop{\sum}\limits_{k=0}^{\frac{n}{2}-1}(-1)^{\frac{n}{2}-k}\binom{n}{k}\,x\cos\big((n-2k)x\big) & , & n \;\; \text{even}
\end{matrix}\right.$$</p>
<p>Hence,</p>
<p>\begin{align*}
\int_{0}^{\pi/2} \frac{x \log \left ( 1-\sin x \right )}{\sin x} \, \mathrm{d}x &= -\int_{0}^{\pi/2} \frac{x}{\sin x} \sum_{n=1}^{\infty} \frac{\sin^n x}{n} \, \mathrm{d}x \\
&=-\sum_{n=1}^{\infty} \frac{1}{n} \int_{0}^{\pi/2} x \sin^{n-1} x \, \mathrm{d}x
\end{align*}</p>
<p>However the lemma does not help at all. In fact, if someone substitutes the RHS what it seems to be in there is an $\arcsin $ Taylor expansion. The series that remains to be evaluated is very daunting.</p>
<p>To sum up, I don't know to what this integral evaluates. I don't even know if a nice closed form exists neither do I expect one. But , I still hope. </p>
| 0non-cybersec
| Stackexchange |
Would it work if I plugged my telephone line directly into the Ethernet switch?. <p>Can I plug the telephone line into an Ethernet switch? Would it work so I get network/internet access if the router is also connected to the same switch or should the telephone line be plugged directly into the router?</p>
| 0non-cybersec
| Stackexchange |
Why is the Stiefel-Whitney class of a manifold $M^n$, $w_n = 0$ for odd n?. <p>I am reading a paper by Massey about Stiefel-Whitney classes. In this paper he claims that it is a "well known fact" that <span class="math-container">$w_n = 0$</span> for an n-dimensional manifold when n is odd. I can't figure out why or get my hands on a reference. Any help is appreciated. </p>
| 0non-cybersec
| Stackexchange |
Proof Reference - Polynomial interpolation at quadrature points. <p>If $\left( p_n \right)_{n=0}^{\infty}$ is a family of orthogonal polynoamials with respect to a measure $\mu$ on $[-1,1]$, and $\left( x_j, w_j \right)$ are the quadrature points and weights for the respective Gaussian quadrature rule, we can easily prove that
$$ f_N (x) : \, = \sum\limits_{n=0}^{N-1} \sum\limits_{j=1}^{N} p_n (x_j) f(x_j) w_j p_n (x) \, ,$$
is the interpolation polynomial of degree $N-1$ for $f$ at the quadrature points $x_1, \ldots x_N$.</p>
<p><strong>My question:</strong> While I could prove it, I couldn't find a reference for this proof in any textbook. Could you help with that?</p>
<p>This is cross-posted from <a href="https://math.stackexchange.com/q/2595490/161591">this</a> post in MSE.</p>
| 0non-cybersec
| Stackexchange |
The Alwas-Killar Road in The Himalayas. One of the highest motorable roads in the world. [video]. | 0non-cybersec
| Reddit |
Is it legal to host user-manual documents on my server?. <p>Is it legal to host user-manual documents (e.g. a user manual for an lcd television in pdf format) on my server? Also, if I made an HTML page that contains a list of all those hosted documents (again on my server) along with advertisements, would that be described as "redistribution" and if so, would that be legal?</p>
<p>Or maybe this question is too generic and should each document's legality would need to be considered in its own context?</p>
| 0non-cybersec
| Stackexchange |
Review: Sex And The City 2:About as enjoyable as a frontal lobotomy, and about as effective.... | 0non-cybersec
| Reddit |
cross gender transformations within seconds (WTF). | 0non-cybersec
| Reddit |
WiFi disabled and black screen after suspend | Ubuntu 18.04. <p>Good morning,</p>
<p>I went through many Debian based distros only not to find any help or support for the issues I encountered, so I decided to go for Ubuntu.</p>
<p>DISCLAIMER: I feel like this is important. NONE of the issues listed below happened during ANY of the "live-media" trials that come with the installations. Actually, at least issue #2 did not happen even right after the installation had finished, because it didn't require a full reboot, only a restart.</p>
<p><strong>Issue #1</strong>: My distro does not receive my Fn+F12 (WiFi hardware switch) leaving me uncapable of turning the WiFi on. (Also doesn't listen to Fn+F2 and Fn+F3 - which are the brightness dials, but Fn+F6/7/8 work - volume dials)</p>
<p><strong>Issue #2</strong>: I have no way to turn WiFi on. I tried everything software-wise, therefore I believe it's only a matter of getting my keybord Fn combos to work. Here is my info-wireless:</p>
<pre><code>########## wireless info START ##########
Report from: 13 Feb 2020 18:23 CET +0100
Booted last: 13 Feb 2020 00:00 CET +0100
Script from: 22 Oct 2018 03:34 UTC +0000
##### release ###########################
Distributor ID: Ubuntu
Description: Ubuntu 18.04.4 LTS
Release: 18.04
Codename: bionic
##### kernel ############################
Linux 5.3.0-28-generic #30~18.04.1-Ubuntu SMP Fri Jan 17 06:14:09 UTC 2020 x86_64 x86_64 x86_64 GNU/Linux
Parameters: ro, quiet, splash, vt.handoff=1
##### desktop ###########################
Ubuntu
##### lspci #############################
02:00.0 Network controller [0280]: Qualcomm Atheros AR9485 Wireless Network Adapter [168c:0032] (rev 01)
Subsystem: Samsung Electronics Co Ltd AR9485 Wireless Network Adapter [144d:4105]
Kernel driver in use: ath9k
03:00.0 Ethernet controller [0200]: Realtek Semiconductor Co., Ltd. RTL810xE PCI Express Fast Ethernet controller [10ec:8136] (rev 05)
Subsystem: Samsung Electronics Co Ltd RTL810xE PCI Express Fast Ethernet controller [144d:c709]
Kernel driver in use: r8169
##### lsusb #############################
Bus 002 Device 002: ID 8087:0024 Intel Corp. Integrated Rate Matching Hub
Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 001 Device 004: ID 0cf3:3004 Atheros Communications, Inc. AR3012 Bluetooth 4.0
Bus 001 Device 002: ID 8087:0024 Intel Corp. Integrated Rate Matching Hub
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
##### PCMCIA card info ##################
##### rfkill ############################
0: phy0: Wireless LAN
Soft blocked: no
Hard blocked: yes
1: hci0: Bluetooth
Soft blocked: no
Hard blocked: no
##### secure boot #######################
SecureBoot disabled
Platform is in Setup Mode
##### lsmod #############################
ath3k 24576 0
mxm_wmi 16384 1 nouveau
bluetooth 573440 34 btrtl,btintel,btbcm,bnep,ath3k,btusb,rfcomm
ath9k 151552 0
ath9k_common 36864 1 ath9k
ath9k_hw 475136 2 ath9k_common,ath9k
ath 36864 3 ath9k_common,ath9k,ath9k_hw
mac80211 847872 1 ath9k
cfg80211 704512 4 ath9k_common,ath9k,ath,mac80211
libarc4 16384 1 mac80211
wmi 32768 2 mxm_wmi,nouveau
##### interfaces ########################
[/etc/network/interfaces]
auto lo
iface lo inet loopback
##### ifconfig ##########################
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
link/loopback <MAC address> brd <MAC address>
inet 127.0.0.1/8 scope host lo
valid_lft forever preferred_lft forever
inet6 ::1/128 scope host
valid_lft forever preferred_lft forever
2: enp3s0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP group default qlen 1000
link/ether <MAC 'enp3s0' [IF1]> brd <MAC address>
inet 192.168.1.124/24 brd 192.168.1.255 scope global dynamic noprefixroute enp3s0
valid_lft 42604sec preferred_lft 42604sec
inet6 fe80::a2b1:6281:6f37:5455/64 scope link noprefixroute
valid_lft forever preferred_lft forever
3: wlp2s0: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN group default qlen 1000
link/ether <MAC 'wlp2s0' [IF2]> brd <MAC address>
##### iwconfig ##########################
enp3s0 no wireless extensions.
lo no wireless extensions.
wlp2s0 IEEE 802.11 ESSID:off/any
Mode:Managed Access Point: Not-Associated Tx-Power=off
Retry short limit:7 RTS thr:off Fragment thr:off
Power Management:off
##### route #############################
default via 192.168.1.1 dev enp3s0 proto dhcp metric 100
169.254.0.0/16 dev enp3s0 scope link metric 1000
192.168.1.0/24 dev enp3s0 proto kernel scope link src 192.168.1.124 metric 100
##### resolv.conf #######################
[777 root '/etc/resolv.conf' -> '../run/systemd/resolve/stub-resolv.conf']
nameserver 127.0.0.53
options edns0
##### network managers ##################
Installed:
NetworkManager
Running:
root 669 1 0 18:10 ? 00:00:00 /usr/sbin/NetworkManager --no-daemon
##### NetworkManager info ###############
GENERAL.DEVICE: enp3s0
GENERAL.TYPE: ethernet
GENERAL.NM-TYPE: NMDeviceEthernet
GENERAL.VENDOR: Realtek Semiconductor Co., Ltd.
GENERAL.PRODUCT: RTL810xE PCI Express Fast Ethernet controller
GENERAL.DRIVER: r8169
GENERAL.DRIVER-VERSION: --
GENERAL.FIRMWARE-VERSION: --
GENERAL.HWADDR: <MAC 'enp3s0' [IF1]>
GENERAL.MTU: 1500
GENERAL.STATE: 100 (connected)
GENERAL.REASON: 0 (No reason given)
GENERAL.UDI: /sys/devices/pci0000:00/0000:00:1c.3/0000:03:00.0/net/enp3s0
GENERAL.IP-IFACE: enp3s0
GENERAL.IS-SOFTWARE: no
GENERAL.NM-MANAGED: yes
GENERAL.AUTOCONNECT: yes
GENERAL.FIRMWARE-MISSING: no
GENERAL.NM-PLUGIN-MISSING: no
GENERAL.PHYS-PORT-ID: --
GENERAL.CONNECTION: Wired connection 1
GENERAL.CON-UUID: b8dbe28f-7722-35e4-bc2c-90446cd5002f
GENERAL.CON-PATH: /org/freedesktop/NetworkManager/ActiveConnection/1
GENERAL.METERED: no (guessed)
CAPABILITIES.CARRIER-DETECT: yes
CAPABILITIES.SPEED: 100 Mb/s
CAPABILITIES.IS-SOFTWARE: no
CAPABILITIES.SRIOV: no
WIRED-PROPERTIES.CARRIER: on
IP4.ADDRESS[1]: 192.168.1.124/24
IP4.GATEWAY: 192.168.1.1
IP4.ROUTE[1]: dst = 0.0.0.0/0, nh = 192.168.1.1, mt = 100
IP4.ROUTE[2]: dst = 192.168.1.0/24, nh = 0.0.0.0, mt = 100
IP4.ROUTE[3]: dst = 169.254.0.0/16, nh = 0.0.0.0, mt = 1000
IP4.DNS[1]: 192.168.1.1
DHCP4.OPTION[1]: network_number = 192.168.1.0
DHCP4.OPTION[2]: requested_domain_search = 1
DHCP4.OPTION[3]: next_server = 192.168.1.1
DHCP4.OPTION[4]: requested_broadcast_address = 1
DHCP4.OPTION[5]: requested_domain_name = 1
DHCP4.OPTION[6]: host_name = gabriele-pc
DHCP4.OPTION[7]: requested_rfc3442_classless_static_routes = 1
DHCP4.OPTION[8]: vendor_unknown_3561 = 4:6:35:34:42:38:30:41:5:d:50:58:35:47:31:49:35:30:32:31:31:38:34:6:8:44:56:41:2d:35:35:39:32
DHCP4.OPTION[9]: requested_netbios_scope = 1
DHCP4.OPTION[10]: requested_time_offset = 1
DHCP4.OPTION[11]: dhcp_lease_time = 43320
DHCP4.OPTION[12]: expiry = 1581657195
DHCP4.OPTION[13]: requested_interface_mtu = 1
DHCP4.OPTION[14]: dhcp_message_type = 5
DHCP4.OPTION[15]: routers = 192.168.1.1
DHCP4.OPTION[16]: ip_address = 192.168.1.124
DHCP4.OPTION[17]: requested_subnet_mask = 1
DHCP4.OPTION[18]: requested_domain_name_servers = 1
DHCP4.OPTION[19]: requested_static_routes = 1
DHCP4.OPTION[20]: subnet_mask = 255.255.255.0
DHCP4.OPTION[21]: requested_wpad = 1
DHCP4.OPTION[22]: domain_name_servers = 192.168.1.1
DHCP4.OPTION[23]: requested_netbios_name_servers = 1
DHCP4.OPTION[24]: broadcast_address = 192.168.1.255
DHCP4.OPTION[25]: requested_routers = 1
DHCP4.OPTION[26]: requested_ms_classless_static_routes = 1
DHCP4.OPTION[27]: requested_ntp_servers = 1
DHCP4.OPTION[28]: requested_host_name = 1
DHCP4.OPTION[29]: dhcp_server_identifier = 192.168.1.1
IP6.ADDRESS[1]: fe80::a2b1:6281:6f37:5455/64
IP6.GATEWAY: --
IP6.ROUTE[1]: dst = ff00::/8, nh = ::, mt = 256, table=255
IP6.ROUTE[2]: dst = fe80::/64, nh = ::, mt = 256
IP6.ROUTE[3]: dst = fe80::/64, nh = ::, mt = 100
CONNECTIONS.AVAILABLE-CONNECTION-PATHS: /org/freedesktop/NetworkManager/Settings/{3}
CONNECTIONS.AVAILABLE-CONNECTIONS[1]: b8dbe28f-7722-35e4-bc2c-90446cd5002f | Wired connection 1
GENERAL.DEVICE: wlp2s0
GENERAL.TYPE: wifi
GENERAL.NM-TYPE: NMDeviceWifi
GENERAL.VENDOR: Qualcomm Atheros
GENERAL.PRODUCT: AR9485 Wireless Network Adapter
GENERAL.DRIVER: ath9k
GENERAL.DRIVER-VERSION: 5.3.0-28-generic
GENERAL.FIRMWARE-VERSION: N/A
GENERAL.HWADDR: <MAC 'wlp2s0' [IF2]>
GENERAL.MTU: 1500
GENERAL.STATE: 20 (unavailable)
GENERAL.REASON: 2 (Device is now managed)
GENERAL.UDI: /sys/devices/pci0000:00/0000:00:1c.0/0000:02:00.0/net/wlp2s0
GENERAL.IP-IFACE: --
GENERAL.IS-SOFTWARE: no
GENERAL.NM-MANAGED: yes
GENERAL.AUTOCONNECT: yes
GENERAL.FIRMWARE-MISSING: no
GENERAL.NM-PLUGIN-MISSING: no
GENERAL.PHYS-PORT-ID: --
GENERAL.CONNECTION: --
GENERAL.CON-UUID: --
GENERAL.CON-PATH: --
GENERAL.METERED: unknown
CAPABILITIES.CARRIER-DETECT: no
CAPABILITIES.SPEED: unknown
CAPABILITIES.IS-SOFTWARE: no
CAPABILITIES.SRIOV: no
WIFI-PROPERTIES.WEP: yes
WIFI-PROPERTIES.WPA: yes
WIFI-PROPERTIES.WPA2: yes
WIFI-PROPERTIES.TKIP: yes
WIFI-PROPERTIES.CCMP: yes
WIFI-PROPERTIES.AP: yes
WIFI-PROPERTIES.ADHOC: yes
WIFI-PROPERTIES.2GHZ: yes
WIFI-PROPERTIES.5GHZ: no
CONNECTIONS.AVAILABLE-CONNECTION-PATHS: --
SSID BSSID MODE CHAN FREQ RATE SIGNAL BARS SECURITY ACTIVE IN-USE
##### NetworkManager.state ##############
[main]
NetworkingEnabled=true
WirelessEnabled=true
WWANEnabled=true
##### NetworkManager config #############
[[/etc/NetworkManager/conf.d/default-wifi-powersave-on.conf]]
[connection]
wifi.powersave = 3
[[/etc/NetworkManager/NetworkManager.conf]]
[main]
plugins=ifupdown,keyfile
[ifupdown]
managed=false
[device]
wifi.scan-rand-mac-address=no
[[/usr/lib/NetworkManager/conf.d/10-dns-resolved.conf]]
[main]
dns=systemd-resolved
[[/usr/lib/NetworkManager/conf.d/10-globally-managed-devices.conf]]
[keyfile]
unmanaged-devices=*,except:type:wifi,except:type:wwan
[[/usr/lib/NetworkManager/conf.d/20-connectivity-ubuntu.conf]]
[connectivity]
uri=http://connectivity-check.ubuntu.com/
[[/usr/lib/NetworkManager/conf.d/no-mac-addr-change.conf]]
[device-mac-addr-change-wifi]
match-device=driver:rtl8723bs,driver:rtl8189es,driver:r8188eu,driver:8188eu,driver:eagle_sdio,driver:wl
wifi.scan-rand-mac-address=no
wifi.cloned-mac-address=preserve
ethernet.cloned-mac-address=preserve
##### NetworkManager profiles ###########
[[/etc/NetworkManager/system-connections/Super-Fi]] (600 root)
[connection] id=Super-Fi | type=wifi | permissions=
[wifi] mac-address=<MAC 'wlp2s0' [IF2]> | mac-address-blacklist= | ssid=Super-Fi
[ipv4] method=auto
[ipv6] method=auto
[[/etc/NetworkManager/system-connections/Super-Fi 1]] (600 root)
[connection] id=Super-Fi 1 | type=wifi | permissions=
[wifi] mac-address=<MAC 'wlp2s0' [IF2]> | mac-address-blacklist= | ssid=Super-Fi
[ipv4] method=auto
[ipv6] method=auto
##### Netplan config ####################
[/etc/netplan/01-network-manager-all.yaml]
network:
version: 2
renderer: NetworkManager
##### iw reg get ########################
Region: Europe/Rome (based on set time zone)
global
country 00: DFS-UNSET
(2402 - 2472 @ 40), (N/A, 20), (N/A)
(2457 - 2482 @ 20), (N/A, 20), (N/A), AUTO-BW, PASSIVE-SCAN
(2474 - 2494 @ 20), (N/A, 20), (N/A), NO-OFDM, PASSIVE-SCAN
(5170 - 5250 @ 80), (N/A, 20), (N/A), AUTO-BW, PASSIVE-SCAN
(5250 - 5330 @ 80), (N/A, 20), (0 ms), DFS, AUTO-BW, PASSIVE-SCAN
(5490 - 5730 @ 160), (N/A, 20), (0 ms), DFS, PASSIVE-SCAN
(5735 - 5835 @ 80), (N/A, 20), (N/A), PASSIVE-SCAN
(57240 - 63720 @ 2160), (N/A, 0), (N/A)
##### iwlist channels ###################
enp3s0 no frequency information.
lo no frequency information.
wlp2s0 13 channels in total; available frequencies :
Channel 01 : 2.412 GHz
Channel 02 : 2.417 GHz
Channel 03 : 2.422 GHz
Channel 04 : 2.427 GHz
Channel 05 : 2.432 GHz
Channel 06 : 2.437 GHz
Channel 07 : 2.442 GHz
Channel 08 : 2.447 GHz
Channel 09 : 2.452 GHz
Channel 10 : 2.457 GHz
Channel 11 : 2.462 GHz
Channel 12 : 2.467 GHz
Channel 13 : 2.472 GHz
##### iwlist scan #######################
enp3s0 Interface doesn't support scanning.
wlp2s0 Interface doesn't support scanning : Network is down
lo Interface doesn't support scanning.
##### module infos ######################
[ath3k]
filename: /lib/modules/5.3.0-28-generic/kernel/drivers/bluetooth/ath3k.ko
firmware: ath3k-1.fw
license: GPL
version: 1.0
description: Atheros AR30xx firmware driver
author: Atheros Communications
srcversion: 76A3AF6F30098E6C760BCBB
depends: bluetooth
retpoline: Y
intree: Y
name: ath3k
vermagic: 5.3.0-28-generic SMP mod_unload
signat: PKCS#7
signer:
sig_key:
sig_hashalgo: md4
[ath9k]
filename: /lib/modules/5.3.0-28-generic/kernel/drivers/net/wireless/ath/ath9k/ath9k.ko
license: Dual BSD/GPL
description: Support for Atheros 802.11n wireless LAN cards.
author: Atheros Communications
srcversion: EF1E6B00DBFECEEC2C25BDC
depends: mac80211,ath9k_hw,ath9k_common,cfg80211,ath
retpoline: Y
intree: Y
name: ath9k
vermagic: 5.3.0-28-generic SMP mod_unload
signat: PKCS#7
signer:
sig_key:
sig_hashalgo: md4
parm: debug:Debugging mask (uint)
parm: nohwcrypt:Disable hardware encryption (int)
parm: blink:Enable LED blink on activity (int)
parm: led_active_high:Invert LED polarity (int)
parm: btcoex_enable:Enable wifi-BT coexistence (int)
parm: bt_ant_diversity:Enable WLAN/BT RX antenna diversity (int)
parm: ps_enable:Enable WLAN PowerSave (int)
parm: use_chanctx:Enable channel context for concurrency (int)
parm: use_msi:Use MSI instead of INTx if possible (int)
[ath9k_common]
filename: /lib/modules/5.3.0-28-generic/kernel/drivers/net/wireless/ath/ath9k/ath9k_common.ko
license: Dual BSD/GPL
description: Shared library for Atheros wireless 802.11n LAN cards.
author: Atheros Communications
srcversion: 923CE24A2D339F2FC6DD39F
depends: ath9k_hw,cfg80211,ath
retpoline: Y
intree: Y
name: ath9k_common
vermagic: 5.3.0-28-generic SMP mod_unload
signat: PKCS#7
signer:
sig_key:
sig_hashalgo: md4
[ath9k_hw]
filename: /lib/modules/5.3.0-28-generic/kernel/drivers/net/wireless/ath/ath9k/ath9k_hw.ko
license: Dual BSD/GPL
description: Support for Atheros 802.11n wireless LAN cards.
author: Atheros Communications
srcversion: 8D2CD0DBA3F81518507202A
depends: ath
retpoline: Y
intree: Y
name: ath9k_hw
vermagic: 5.3.0-28-generic SMP mod_unload
signat: PKCS#7
signer:
sig_key:
sig_hashalgo: md4
[ath]
filename: /lib/modules/5.3.0-28-generic/kernel/drivers/net/wireless/ath/ath.ko
license: Dual BSD/GPL
description: Shared library for Atheros wireless LAN cards.
author: Atheros Communications
srcversion: DDC1D7EDF68EB04D2B8EE13
depends: cfg80211
retpoline: Y
intree: Y
name: ath
vermagic: 5.3.0-28-generic SMP mod_unload
signat: PKCS#7
signer:
sig_key:
sig_hashalgo: md4
[mac80211]
filename: /lib/modules/5.3.0-28-generic/kernel/net/mac80211/mac80211.ko
license: GPL
description: IEEE 802.11 subsystem
srcversion: 6E0E397891117C00B7DB9BA
depends: cfg80211,libarc4
retpoline: Y
intree: Y
name: mac80211
vermagic: 5.3.0-28-generic SMP mod_unload
signat: PKCS#7
signer:
sig_key:
sig_hashalgo: md4
parm: minstrel_vht_only:Use only VHT rates when VHT is supported by sta. (bool)
parm: max_nullfunc_tries:Maximum nullfunc tx tries before disconnecting (reason 4). (int)
parm: max_probe_tries:Maximum probe tries before disconnecting (reason 4). (int)
parm: beacon_loss_count:Number of beacon intervals before we decide beacon was lost. (int)
parm: probe_wait_ms:Maximum time(ms) to wait for probe response before disconnecting (reason 4). (int)
parm: ieee80211_default_rc_algo:Default rate control algorithm for mac80211 to use (charp)
[cfg80211]
filename: /lib/modules/5.3.0-28-generic/kernel/net/wireless/cfg80211.ko
description: wireless configuration support
license: GPL
author: Johannes Berg
srcversion: 7A4BDDDDFBDE4DDDB63AAE3
depends:
retpoline: Y
intree: Y
name: cfg80211
vermagic: 5.3.0-28-generic SMP mod_unload
signat: PKCS#7
signer:
sig_key:
sig_hashalgo: md4
parm: bss_entries_limit:limit to number of scan BSS entries (per wiphy, default 1000) (int)
parm: ieee80211_regdom:IEEE 802.11 regulatory domain code (charp)
parm: cfg80211_disable_40mhz_24ghz:Disable 40MHz support in the 2.4GHz band (bool)
##### module parameters #################
[ath9k]
blink: 0
bt_ant_diversity: 0
btcoex_enable: 0
led_active_high: -1
nohwcrypt: 0
ps_enable: 0
use_chanctx: 0
use_msi: 0
[mac80211]
beacon_loss_count: 7
ieee80211_default_rc_algo: minstrel_ht
max_nullfunc_tries: 2
max_probe_tries: 5
minstrel_vht_only: Y
probe_wait_ms: 500
[cfg80211]
bss_entries_limit: 1000
cfg80211_disable_40mhz_24ghz: N
ieee80211_regdom: 00
##### /etc/modules ######################
##### modprobe options ##################
[/etc/modprobe.d/amd64-microcode-blacklist.conf]
blacklist microcode
[/etc/modprobe.d/blacklist-ath_pci.conf]
blacklist ath_pci
[/etc/modprobe.d/blacklist.conf]
blacklist evbug
blacklist usbmouse
blacklist usbkbd
blacklist eepro100
blacklist de4x5
blacklist eth1394
blacklist snd_intel8x0m
blacklist snd_aw2
blacklist i2c_i801
blacklist prism54
blacklist bcm43xx
blacklist garmin_gps
blacklist asus_acpi
blacklist snd_pcsp
blacklist pcspkr
blacklist amd76x_edac
[/etc/modprobe.d/blacklist-rare-network.conf]
alias net-pf-3 off
alias net-pf-6 off
alias net-pf-9 off
alias net-pf-11 off
alias net-pf-12 off
alias net-pf-19 off
alias net-pf-21 off
alias net-pf-36 off
[/etc/modprobe.d/intel-microcode-blacklist.conf]
blacklist microcode
[/etc/modprobe.d/iwlwifi.conf]
remove iwlwifi \
(/sbin/lsmod | grep -o -e ^iwlmvm -e ^iwldvm -e ^iwlwifi | xargs /sbin/rmmod) \
&& /sbin/modprobe -r mac80211
##### rc.local ##########################
grep: /etc/rc.local: No such file or directory
##### pm-utils ##########################
##### udev rules ########################
##### dmesg #############################
[ 23.519982] ath9k 0000:02:00.0 wlp2s0: renamed from wlan0
[ 47.568598] r8169 0000:03:00.0 enp3s0: Link is Down
[ 49.077991] r8169 0000:03:00.0 enp3s0: Link is Up - 100Mbps/Full - flow control off
[ 49.078017] IPv6: ADDRCONF(NETDEV_CHANGE): enp3s0: link becomes ready
########## wireless info END ############
</code></pre>
<p><strong>Issue #3</strong>: When I suspend the laptop, either by closing the lid or clicking suspend, it does not turn back on. The power ligth stops blinking but the screen stays black.</p>
<p>Any ideas?</p>
| 0non-cybersec
| Stackexchange |
Ver Teresa Capitulo 150 Telenovela | Completos. | 0non-cybersec
| Reddit |
Find point of tangency on a Surface. <p>Find the point on the surface <span class="math-container">$x^3-2y^2+z^2=27$</span> where the tangent plane is perpendicular to the line given parametrically as <span class="math-container">$x=3t-5,y=2t+7,z=1-\sqrt{2}t$</span>.</p>
<p>I have no idea where to start. I am aware that two vectors <span class="math-container">$\mathbf{u}$</span> and <span class="math-container">$\mathbf{v}$</span> are orthogonal if <span class="math-container">$\mathbf{u}\cdot\mathbf{v}=0$</span>. Can this be used here?</p>
<h1>Edit</h1>
<p><span class="math-container">$$\nabla f(x,y,z)=\begin{pmatrix}3x^2 & -4y & 2z\end{pmatrix},$$</span> so <span class="math-container">$$\left\{\begin{array}{l}3x^2 &= 3\\ -4y &= 2\\ 2z &= -\sqrt{2}\end{array}\right.$$</span> However, the solution <span class="math-container">$(\pm 1, -1/2, -\sqrt{2}/2)$</span> Is not a point on the surface of the original function.</p>
| 0non-cybersec
| Stackexchange |
Find the integer : $x \times 29$ and delete the first and last digit, it produces $x$. <p>I want to find the smallest integer <span class="math-container">$x$</span> which satisfies the following condition. </p>
<p><span class="math-container">$x \times 29$</span> and delete the first and last digit, it produces <span class="math-container">$x$</span></p>
<p>Using python, I made some code and figure out the answer is <span class="math-container">$52631579 \times 29 = 1526315791$</span>. </p>
<p>I have trouble writing this in a formal way. I mean setting up equations and solving variables. How one can show <span class="math-container">$x=52631579$</span> without trial and error? </p>
| 0non-cybersec
| Stackexchange |
ASP.NET storing encrypted & salted Password. <p>I have a question about storing encrypted passwords in your database to help secure them. I have a class that encrypts the password passed in and returns a string. This string has 3 parts too it, all separated by a colon. The first part is the iteration, the 2nd part of it is the salt, and the third part of it is the encrypted password. Ex: "1000:{salt}:{encrypted password}". </p>
<p>My question is how am I suppose to store this? As of right now, I am storing the entire string in my database under the password column. Then when I go to check the passwords for a login, I retrieve that record, and I have a method in my class that parses it and verifies that the two passwords match. Is this a big 'no no?' I've read where some people store the salt in it's own column then pull that down when verifying a login. However, this class that I am using for the encryption will return a string like I showed above. Then it came with a method that I can just pass that entire string into it and it will parse it up and verify the passwords as a login. </p>
<p>I guess what I'm asking is, do I need to re-construct my class to separate the string ("{iteration}:{salt}:{encrypted password}"), or is storing that entire string in the database OK?</p>
| 0non-cybersec
| Stackexchange |
Are there any methods for finding analytic solutions to this equation $(xy + \frac1e)e^{F(x,y)} = F(g(y)x , f(y))$. <p>I'm trying to solve the equation $$
\left(xy + \frac1e\right)e^{F(x,y)} = F(g(y)x , f(y))
$$
for $F(x,y)$ where $f$ and $g$ are known functions, analytic in a neighborhood of $0$, with $g(0) = 1$ , $f(0) = 0$, and $f'(0) = 1$. I know how to find a formal power series
$$
F(x,y) = \sum_{n,m\ge0} a_{n,m} x^n y^m
$$
but this is a hassle to do and I don't that it will converge for any nonzero $x,y$, so I'm wondering if there's an alternative way to solve this type of equation.</p>
<p>For my particular application, $f$ can be any analytic function satisfying $f(0) = 0$ and $f'(0) = 1$, but $g$ will be related to $f$ by $f(y) g(y) = y$.</p>
| 0non-cybersec
| Stackexchange |
OWA marks messages as unread on deletion. <p>I'm using OWA in FF 65, with Exchange 2016(?) as a backend.</p>
<p>Whenever I delete a message, it shows up in the deleted folder as a new message. This screws up my notifier for unread messages, making it very difficult to know when I have new mail.</p>
<p>I've searched but not been able to find a solution. I've tried setting the option "Mark the item displayed in the reading pane as read" at 0 seconds, but even with the email already marked as read it still shows up as unread in deleted items :(</p>
| 0non-cybersec
| Stackexchange |
Isotope Decay / half-life. <p>Suppose you start with 100g of an isotope that has a half life of 17 years. How long before 20g of the isotope are left?</p>
<p>What's the general formula for these problems? </p>
| 0non-cybersec
| Stackexchange |
How can I get my "friends" to notice me?. I wrote friends like that because they're not really my friends,but close to that.I see them only on my school bus and after school we play games together.They always go out together and I'd like to be with them.I've never had a social life for my 18 years and I'm tired of this.I feel this is my last chance for friends because I'm not gonna be seeing them anymore when the schools ends.I don't wanna spend another Summer 24/7 in my house.
I'd like to go out with them or something because we all really get along,but I can't ask them to ask me out,I would sound even more desperate.Help please.. | 0non-cybersec
| Reddit |
Error Opening HKEY_USERS for [COMPUTER NAME] PsLoggedon. <ul>
<li>I use windows server 2008R2</li>
</ul>
<p>I want to see who is currently Logged on a Machine. I used <code>PsLoggedOn \\Machine Name or IP</code>
but it gives me the following error:</p>
<p><strong>Error Opening HKEY_USERS for [COMPUTER NAME]</strong>
<strong>Unable to query resource logons</strong></p>
<p>any suggestion?</p>
| 0non-cybersec
| Stackexchange |
Scientists find first evidence of huge Mars underground water system.. | 0non-cybersec
| Reddit |
Is it true that $\lim_{n\to \infty} \dfrac{\int_{\frac{1}{n}}^{1}\frac{f(x)}{x}dx}{n}=0$?. <p>Suppose $f$ is $L^{1}[0,\infty)$ and non-negative, and $\int_{0}^{\infty}f(x)dx=1$. </p>
<p>Is it true that $lim_{n\to \infty} \dfrac{\int_{\frac{1}{n}}^{1}\frac{f(x)}{x}dx}{n}=0$?</p>
<p>I derive this problem from a probability problem where I am asked to compute a limit of an expectation and $f$ is the probability density function. However, I cannot make an estimate for this integral.</p>
<p>Thanks!</p>
| 0non-cybersec
| Stackexchange |
Is $1=1$ tautology?. <p>Is "1=1" tautology ?</p>
<p>In this case, "1" means multiplicative identity of real number.</p>
<p>If we treat "1=1" as a simple proposition p , we will get p is not tautology.</p>
<p>But p is always true because it denotes "1=1" which is always true </p>
<p>Can we say that "1=1" is tautology?</p>
| 0non-cybersec
| Stackexchange |
That look at the end (Xpost r/interestingasfuck). | 0non-cybersec
| Reddit |
Could not believe it when I got the request. | 0non-cybersec
| Reddit |
Value of type 'String' has no member 'characterAtIndex'. <p>I'm using the following UITextFieldDelegate method:</p>
<pre><code>func textField(textField: UITextField, shouldChangeCharactersInRange range: NSRange,
replacementString string: String) -> Bool {
</code></pre>
<p>and get the error-message above when trying to access the first character:</p>
<pre><code>let firstChar = string.characterAtIndex(0)
</code></pre>
<p>I don't know what's wrong with this code, since the NSString class reference lists the function:</p>
<pre><code>func characterAtIndex(_ index: Int) -> unichar
</code></pre>
<p>Do you know what I am doing wrong?</p>
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@fernandinho tears into the British press' treatment of @ManCity team-mate @sterling7 and claims they are deliberately 'pursuing' the winger. #MCFC. | 0non-cybersec
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Woman who fought off sex attacker with her keys receives bravery award. | 0non-cybersec
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