Mathematics
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Robin Chapman

Apparently, this user prefers to keep an air of mystery about them.

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80 Evaluating the integral $\int_0^\infty \frac{\sin x} x \,\mathrm dx = \frac \pi 2$? Sep 23 '10
68 Why is $e^{\pi \sqrt{163}}$ almost an integer? Sep 13 '10
66 If $a \mid m$ and $(a + 1) \mid m$, prove $a(a + 1) | m$. Aug 23 '10
48 Inverse of an invertible triangular matrix (either upper or lower) is triangular of the same kind Sep 17 '10
48 Comparing $\pi^e$ and $e^\pi$ without calculating them Oct 26 '10
45 Does $R[x] \cong S[x]$ imply $R \cong S$? Dec 8 '10
44 Are all algebraic integers with absolute value 1 roots of unity? Sep 9 '10
38 Does there exist a bijective $f:\mathbb{N} \to \mathbb{N}$ such that $\sum f(n)/n^2$ converges? Aug 11 '10
31 Why is it harder to prove which integers are sums of three squares rather than sums of two squares or four squares? Dec 9 '10
29 Why is $\mathbb{Q}(t,\sqrt{t^3-t})$ not a purely transcendental extension of $\mathbb{Q}$? Sep 23 '10
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