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Mathematics
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zhw.
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Cauchy is mad and there is nothing that can be done about him, although, right now, he is the only one who knows how mathematics should be done. – Abel

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answer
80
How to show $\ \int_1^\infty\frac1xdx\ $ diverges (not using the harmonic series)?
Jul 16, 2015
answer
36
Does there exists an entire function $f: \mathbb C \to \mathbb C$ which is bounded on real line and imaginary line?
Jun 28, 2015
answer
34
Intuitively understanding Fatou's lemma
Aug 12, 2016
answer
31
Proof that $\sqrt x$ is absolutely continuous.
Nov 23, 2015
answer
25
What's wrong with l'Hopital's rule?
May 17, 2015
answer
24
$f \in L^1$, but $f \not\in L^p$ for all $p > 1$
Nov 14, 2015
answer
23
$C^1$ function on compact set is Lipschitz
Jun 28, 2017
answer
22
Let $S\subset [0,1]^2$ be uncountable. Is there a line which contains infinitely many points of $S$?
Sep 30, 2017
answer
21
Help on a Putnam Problem from the 90s
Oct 6, 2016
answer
20
Show that $f$ is the zero function if $f''(x)=f(x)$ and $f(0)=f'(0)=0$
Dec 2, 2016