# Damaru

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bio website location age member for 1 year, 7 months seen Jun 25 at 18:20 profile views 25

# 3 Questions

 3 Why isn't this function $f:\mathbb N \to \mathcal P(\mathbb N)$ a surjection? 1 if $\sum_{n=1}^{\infty }a_{n}$ converges ($a_{n}$ are non negatives), study the convergence of the serie $\sum_{n=1}^{\infty }\sqrt{\frac{a_{n}}{n}}$ 0 A diffeomorphism with negative Jacobian swaps the orientation?

# 27 Reputation

 +15 Why isn't this function $f:\mathbb N \to \mathcal P(\mathbb N)$ a surjection? +5 if $\sum_{n=1}^{\infty }a_{n}$ converges ($a_{n}$ are non negatives), study the convergence of the serie $\sum_{n=1}^{\infty }\sqrt{\frac{a_{n}}{n}}$

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# 7 Tags

 0 analysis 0 elementary-set-theory 0 cardinals 0 real-analysis 0 differential-geometry 0 sequences-and-series 0 divergent-series

# 2 Accounts

 Mathematics 27 rep 6 Stack Overflow 1 rep
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