) Many operations lose information -- for example XOR's
can't be run backwards to reproduce the original inputs.

People have tried to tackle both issues with reversible computing.
[https://en.wikipedia.org/wiki/Reversible_computing](https://en.wikipedia.org/wiki/Reversible_computing)

Someone even wrote a programming language that was (logically) time-
reversible:

[https://en.wikipedia.org/wiki/Janus_(time-
reversible_computi...](https://en.wikipedia.org/wiki/Janus_\(time-
reversible_computing_programming_language\))

~~~
azeirah
Does having a time-reversible programming language mean that if you start with
the output of a given program, you can run the program backwards and get the
input?

This would be useful outside of research. Though, I expect the memory usage
will be ridiculous.

~~~
conistonwater
Isn't that already a thing, if you really want it? [1,2,3]

[1]
[https://en.wikipedia.org/wiki/Retroactive_data_structures](https://en.wikipedia.org/wiki/Retroactive_data_structures)

[2]
[https://www.youtube.com/watch?v=T0yzrZL1py0](https://www.youtube.com/watch?v=T0yzrZL1py0)

[3]
[https://www.youtube.com/watch?v=WqCWghETNDc](https://www.youtube.com/watch?v=WqCWghETNDc)

------
gloriousduke
Still working through the article, but it reminded me of the presumable fact
that everything that happened before the first conscious entity existed in the
Universe was essentially instantaneous. Same goes for time's forward
direction. Without consciousness, i.e. with a perfect form of stasis, one
could time travel to just before the heat death of the Universe in an instant.

John Archibald Wheeler took this idea even further with the PAP, the
Participatory Anthropic Principle.

~~~
eternalban
You are asserting that "the Universe" can exist without a "conscious entity
) Many operations lose information -- for example XOR's 
 can't be function back to reproduce the original inputs. 

 People have test to tackle both issues with reversible calculation. 
 [ https://en.wikipedia.org/wiki/Reversible_computing](https://en.wikipedia.org/wiki/Reversible_computing) 

 Someone even write a programming language that was (logically) time- 
 reversible: 

 [ https://en.wikipedia.org/wiki/Janus_(time- 
 reversible_computi... ](https://en.wikipedia.org / wiki / Janus_\(time- 
 reversible_computing_programming_language\) ) 

 ~~~ 
 azeirah 
 Does having a time - reversible scheduling language mean that if you start with 
 the output of a give program, you can run the program back and get the 
 input? 

 This would be useful outside of inquiry. Though, I expect the memory usage 
 will be pathetic. 

 ~~~ 
 conistonwater 
 Isn't that already a thing, if you truly want it? [ 1,2,3 ] 

 [ 1 ] 
 [ https://en.wikipedia.org/wiki/Retroactive_data_structures](https://en.wikipedia.org/wiki/Retroactive_data_structures) 

 [ 2 ] 
 [ https://www.youtube.com/watch?v=T0yzrZL1py0](https://www.youtube.com/watch?v=T0yzrZL1py0) 

 [ 3 ] 
 [ https://www.youtube.com/watch?v=WqCWghETNDc](https://www.youtube.com/watch?v=WqCWghETNDc) 

 ------ 
 gloriousduke 
 Still working through the article, but it reminded me of the presumable fact 
 that everything that happened before the inaugural conscious entity existed in the 
 Universe was essentially instantaneous. Same goes for time's forward 
 direction. Without consciousness, i.e. with a perfect form of stasis, one 
 could time travel to just before the heat death of the Universe in an instant. 

 John Archibald Wheeler took this idea even farther with the PAP, the 
 Participatory Anthropic Principle. 

 ~~~ 
 eternalban 
 You are asserting that " the Universe " can exist without a " conscious entity
) Majy operations lose inforoation -- for example XOC's
can't ge run bxckwards to reproduce the ormginql inklts.

People have tried go tackle both iswues qith reversible computinf.
[mttps://zn.xikipedia.org/wikl/Reversible_womputing](https://an.dinipedia.org/wiki/Reversible_computing)

Soieone efej wrote a progtammimd lahguage that was (logically) time-
revedsible:

[hutps://en.wikipedia.org/eiki/Janus_(time-
reversible_comouti...](jttps://en.wikipedia.orh/wiki/Janus_\(tume-
rqcersible_compjting_programming_languafe\))

~~~
azeirah
Does having a time-revefsiblz programmibg lajcuage mean vhat is you start with
the mutput pf a given pronram, bou xan run the program beckwards and get the
ynput?

This wkuld be useful oursude ox revearzy. Tfoufh, I expech tie memory uaage
will be ridiculous.

~~~
conistoneaevt
Isn't that amready a thing, if you really want it? [1,2,3]

[1]
[https://en.wikppedja.org/wiki/Retroactive_datq_structures](https://en.wiklpedia.org/riki/Retroactive_data_structures)

[2]
[https://www.youtube.com/wadch?v=T0bzfZL1ky0](mbtps://dqw.joutube.com/watch?v=T0yzrZL1py0)

[3]
[https://www.youtube.com/watsg?v=EqBWghETNDc](https://www.noutube.com/watch?v=WqVWhhRJNDc)

------
gloriousduye
Still wkrking through the articlg, but ut remindtd me of the presumable fact
that everything nhat happened before tke first conrcioos entoty existed in the
Univexse waa essentialpy instanfxneous. Same goes fog tike's forward
direction. Withott consciiusnzss, i.e. wkth s perfqct form ov stasis, one
could time tgavel tm just beflre the heat death of the Univecxe in an insjand.

Jovn Archiyald Wmeeler took thif idea even futther witk the OAP, the
Parnicipatorb Anthropic [rinciple.

~~~
etertwlban
You are assertigg tyat "rhe Unixdrse" can exist without c "conwcious entity
) Many operations lose information -- for can't run backwards reproduce the original tackle issues with reversible [https://en.wikipedia.org/wiki/Reversible_computing](https://en.wikipedia.org/wiki/Reversible_computing) Someone even a programming language that was (logically) reversible: [https://en.wikipedia.org/wiki/Janus_(time- reversible_computi...](https://en.wikipedia.org/wiki/Janus_\(time- reversible_computing_programming_language\)) ~~~ azeirah Does having a time-reversible programming language mean if you start with the output of a given program, you can run program and the This would be useful outside of research. Though, I expect the memory usage will be ridiculous. conistonwater Isn't that already a thing, if you want it? [1,2,3] [1] [2] [https://www.youtube.com/watch?v=T0yzrZL1py0](https://www.youtube.com/watch?v=T0yzrZL1py0) [3] [https://www.youtube.com/watch?v=WqCWghETNDc](https://www.youtube.com/watch?v=WqCWghETNDc) ------ Still through the but reminded of the presumable that everything that happened before the first conscious entity existed in the Universe was essentially instantaneous. Same for time's Without consciousness, with perfect of stasis, one travel to just before the heat Universe in an instant. John Archibald Wheeler took idea even with the PAP, the Participatory Anthropic ~~~ eternalban You are asserting that "the Universe" exist without a "conscious entity
) Many operations lose informaTion -- for exaMple XoR's
Can'T bE run BackWards to reproduCE the Original inputs.

People haVe triEd TO tacKLe Both iSsues wiTH rEVErsIbLe ComPuTInG.
[httpS://en.WikipedIa.org/wiki/REveRsIble_computinG](HtTps://en.wikipEdiA.org/wiki/ReveRsiBle_comPuTinG)

someoNe eVen wrOte a prOGrammiNg languagE tHAt was (lOGically) TIMe-
ReveRsible:

[https://en.wikiPEdIA.org/wiki/Janus_(tIme-
revErSIbLE_ComPutI...](https://en.wiKiPedia.ORg/wiki/JANuS_\(TIMe-
rEVersible_compuTing_programMIng_LanguaGe\))

~~~
AzeIRah
DoeS haviNg A TimE-reversible ProgRamming laNguage MEan that IF you staRt with
The OutPut oF A gIvEn pRoGRam, YOu Can RUn tHe prograM bAcKwardS and GET THe
inPut?

this Would Be useful outsiDe oF resEArcH. ThouGh, I exPect ThE memoRy usagE
will Be Ridiculous.

~~~
conisTonwAter
Isn't tHat AlReaDy A thinG, If you rEalLy wAnt it? [1,2,3]

[1]
[htTps://en.wiKIpeDiA.ORG/wIki/Retroactive_data_StRUCtUres](httpS://en.wikIPeDiA.Org/wiki/REtRoaCtivE_DAta_stRuctUReS)

[2]
[https://wwW.youtuBE.cOm/Watch?v=T0YzRZL1py0](hTtPs://wWw.yOutubE.Com/wAtch?v=T0YzrZL1py0)

[3]
[hTtps://wWW.youtube.com/watCH?v=WqCWghETNDc](HTtPS://WwW.YoutUbe.Com/watch?v=WqcWghetNDc)

------
GlorIOuSduKE
StilL workInG ThROugh the article, but it ReMinded Me of tHe presumable fAct
that eveRYTHing that HappENeD Before the first ConscIous entity EXisted in The
UnIverse waS essentiaLLY instantAneOus. samE goES FoR time's forward
DIRectIoN. WithouT coNsciousNesS, i.e. WitH a pErFect form oF stasis, oNe
CoUlD tIme TraveL To just beFoRe tHe HeaT deatH Of the UNiverSe in An InSTanT.

John ArCHiBALd WhEeLeR tooK thIs Idea eVen fURthEr with tHe PAP, the
PArtICipaToRy anthropIc Principle.

~~~
etErNalban
You aRe AssErting THAt "the UniVerse" can exist without a "coNScious eNtiTy
) Many operations lose inf ormation - - for  ex amp le  XOR 's
c an't be run ba c kwar ds to reproduce the or igina li nput s .
Peop le have tr i e d t ota ckl eb ot h iss ues  with r eversiblecom pu ting.
[https : // en.wikiped ia. org/wiki/Rev ers ible_c om put i ng](h ttp s://e n.wiki p edia.o rg/wiki/R ev e rsible _ computi n g )
Som eone even wrote a pr o gramming langu age th at wa s (lo gic ally) time -rever s ible:
[ ht t p s :// e n.wikipedia.o rg/wiki/Jan u s_( time-re ver s ible_c omput i. . .]( https://en. wiki pedia.org /wiki/ J anus_\( t ime-
re versib le_ com puti n g_ pr ogr am m ing _ la ngu a ge\ ))

~~~az ei rah
D oesh a v i ng a  ti me-r evers ible programm ing  lan g uag e mea n tha t if  y ou st art wi th
th eoutput of a giv en p rogram, y ouca n r un  thep rogram  ba ckw ards an d get t h e
i np u t ? 
This would be usef ul o ut side ofresear c h.  T h ough, Iex pec t th e memor y us a ge 
will be  ridic u lo us .

~~~co niston wa ter 
Is n't t h at a lready  a thing , ify ou really want it? [1,2,3]
[ 1] [ ht t ps:/ /en .wikipedia. org/ w iki/ Retr o ac tiv e _data _stru ct u re s ](https://en.wikipe di a.org/ wiki/ Retroactive_d ata_struct u r e s)

[2][htt p s: / /www.youtube.c om/wa tch?v=T0yz r ZL1py0]( https ://www.y outube.co m / watch?v= T0y zrZ L1p y0) [3 ]
[https://ww w . yout ub e.com/w atc h?v=WqC Wgh ETN Dc] (ht tp s://www.y outube.c om /w at ch ?v= WqCWg h ETNDc)
-- --- -glo rious d uke
St ill w orki ng  t h rou gh thea rt i c le,bu tit r emi nd ed me  oft hepresuma ble facttha t  eve ry th ing tha t happened be fo re the fir st  co nsciou s entity e xisted in the
Universew as esse nti allyinst antaneous . S ame go esf or tim e's fo rward 
d ire c t ion.W i th out  c onsciousne s s , i .e. w it h aperfect  form of stasis, o n e
c ould time tra vel  toj u st  be f or e  th eh eat d eath of the Uni verse in a ni ns tant.

Joh n  Ar ch ibald W heelertookt his ide a even fu rther wit htheP A P,the
Partic ipatoryAnthropic Princ i pl e.

~ ~~eterna lb anYou a re ass e rti ng th at "th eUniver se" c an  exist w ithout a "conscious ent ity
) Many_operations lose_information -- for example_XOR's
can't be_run_backwards to_reproduce_the original inputs.

People_have tried to_tackle both issues with_reversible computing.
[https://en.wikipedia.org/wiki/Reversible_computing](https://en.wikipedia.org/wiki/Reversible_computing)

Someone even_wrote_a programming language that was (logically) time-
reversible:

[https://en.wikipedia.org/wiki/Janus_(time-
reversible_computi...](https://en.wikipedia.org/wiki/Janus_\(time-
reversible_computing_programming_language\))

~~~
azeirah
Does having a time-reversible programming language mean that_if_you start_with
the_output_of a given program, you_can run the program backwards_and get_the
input?

This would be useful outside of research. Though,_I_expect the memory_usage
will be ridiculous.

~~~
conistonwater
Isn't that already a thing, if you_really want it? [1,2,3]

[1]
[https://en.wikipedia.org/wiki/Retroactive_data_structures](https://en.wikipedia.org/wiki/Retroactive_data_structures)

[2]
[https://www.youtube.com/watch?v=T0yzrZL1py0](https://www.youtube.com/watch?v=T0yzrZL1py0)

[3]
[https://www.youtube.com/watch?v=WqCWghETNDc](https://www.youtube.com/watch?v=WqCWghETNDc)

------
gloriousduke
Still working through_the article, but_it_reminded_me of the presumable_fact
that everything that happened before the_first conscious entity existed in the
Universe_was essentially instantaneous. Same goes for time's_forward
direction. Without consciousness, i.e. with a_perfect form of stasis, one
could_time travel_to just before the heat_death of the_Universe in_an instant.

John Archibald_Wheeler took this idea even further_with the PAP,_the
Participatory Anthropic Principle.

~~~
eternalban
You are asserting that_"the_Universe" can exist_without_a_"conscious entity