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zhw.

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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65 How to show $\ \int_1^\infty\frac1xdx\ $ diverges (not using the harmonic series)? Jul 16 '15
35 Does there exists an entire function $f: \mathbb C \to \mathbb C$ which is bounded on real line and imaginary line? Jun 28 '15
22 Proof that $\sqrt x$ is absolutely continuous. Nov 23 '15
21 Let $S\subset [0,1]^2$ be uncountable. Is there a line which contains infinitely many points of $S$? Sep 30 '17
21 Intuitively understanding Fatou's lemma Aug 12 '16
20 Help on a Putnam Problem from the 90s Oct 6 '16
20 What's wrong with l'Hopital's rule? May 17 '15
19 Is there a continuous function from $[0,1]$ to $\mathbb R$ that satisfies Aug 30 '15
18 Show that $f$ is the zero function if $f''(x)=f(x)$ and $f(0)=f'(0)=0$ Dec 2 '16
17 How do i find this limit WITHOUT L'hôpitals rule May 16 '17
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