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246 'Obvious' theorems that are actually false Jun 4 '14
139 Are there any open mathematical puzzles? Oct 19 '13
106 Reasoning that $ \sin2x=2 \sin x \cos x$ Aug 5 '13
88 How to prove $\int_{-\infty}^{+\infty} f(x)dx = \int_{-\infty}^{+\infty} f\left(x - \frac{1}{x}\right)dx?$ Aug 1 '13
85 What is the oldest open problem in geometry? Aug 8 '14
70 How can one prove that $e<\pi$? Sep 10 '13
69 Closed form for $\int_0^1\log\log\left(\frac{1}{x}+\sqrt{\frac{1}{x^2}-1}\right)\mathrm dx$ May 13 '13
68 An integral involving Airy functions $\int_0^\infty\frac{x^p}{\operatorname{Ai}^2 x + \operatorname{Bi}^2 x}\mathrm dx$ Oct 12 '13
62 Unexpected approximations which have led to important mathematical discoveries May 11 '13
47 How can I find $\sum\limits_{n=0}^{\infty}\left(\frac{(-1)^n}{2n+1}\sum\limits_{k=0}^{2n}\frac{1}{2n+4k+3}\right)$? Apr 17 '13
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