User AgCl - Mathematics Stack Exchange

320 votes

A challenge by R. P. Feynman: give counter-intuitive theorems that can be translated into everyday language

answered Jul 21, 2010 at 6:12

188 votes

Accepted

Why does the series $\sum_{n=1}^\infty\frac1n$ not converge?

answered Jul 21, 2010 at 5:13

35 votes

Accepted

What are good books/other readings for elementary set theory?

answered Nov 21, 2010 at 5:27

28 votes

Drawing heart in mathematica

answered Nov 28, 2010 at 2:49

26 votes

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Axiom of choice - to use or not to use

answered Dec 4, 2010 at 5:33

14 votes

Accepted

Completion of rational numbers via Cauchy sequences

answered Nov 26, 2010 at 4:50

11 votes

Accepted

Is $L^2(\mathbb{R})$ with convolution a Banach Algebra?

answered Nov 20, 2010 at 17:19

10 votes

How to prove that the derivative of Heaviside's unit step function is the Dirac delta?

answered Dec 12, 2010 at 7:17

4 votes

Accepted

Question about irrational numbers

answered Nov 23, 2010 at 21:23

3 votes

Are there any functions that are (always) continuous yet not differentiable? Or vice-versa?

answered Jul 21, 2010 at 3:42

1 vote

How to show $\ell^2_p$ not isometric to $\ell^2_{p'}$ unless $p\in\{1,2,\infty\}$?

answered Nov 23, 2010 at 7:55

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11 Answers

A challenge by R. P. Feynman: give counter-intuitive theorems that can be translated into everyday language

Why does the series $\sum_{n=1}^\infty\frac1n$ not converge?

What are good books/other readings for elementary set theory?

Drawing heart in mathematica

Axiom of choice - to use or not to use

Completion of rational numbers via Cauchy sequences

Is $L^2(\mathbb{R})$ with convolution a Banach Algebra?

How to prove that the derivative of Heaviside's unit step function is the Dirac delta?

Question about irrational numbers

Are there any functions that are (always) continuous yet not differentiable? Or vice-versa?

How to show $\ell^2_p$ not isometric to $\ell^2_{p'}$ unless $p\in\{1,2,\infty\}$?