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Robin Chapman's user avatar
Robin Chapman's user avatar
Robin Chapman's user avatar
Robin Chapman
  • Member for 13 years, 11 months
  • Last seen more than 13 years ago
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89
Evaluating the integral $\int_0^\infty \frac{\sin x} x \,\mathrm dx = \frac \pi 2$?
Sep 23, 2010
87
Why is $e^{\pi \sqrt{163}}$ almost an integer?
Sep 13, 2010
71
Inverse of an invertible triangular matrix (either upper or lower) is triangular of the same kind
Sep 17, 2010
68
If $a \mid m$ and $(a + 1) \mid m$, prove $a(a + 1) | m$.
Aug 23, 2010
55
Are all algebraic integers with absolute value 1 roots of unity?
Sep 9, 2010
50
Comparing $\pi^e$ and $e^\pi$ without calculating them
Oct 26, 2010
47
Does $R[x] \cong S[x]$ imply $R \cong S$?
Dec 8, 2010
44
Does there exist a bijective $f:\mathbb{N} \to \mathbb{N}$ such that $\sum f(n)/n^2$ converges?
Aug 11, 2010
37
Efficiently finding two squares which sum to a prime
Oct 2, 2010
34
Recovering the two $SU(2)$ matrices from $SO(4)$ matrix
Aug 30, 2010
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The return key in comments
25
Threatening emails from Jeff Atwood
4
Visual noise on the main page
3
To what extent should copyrighted material be made available on math.se?
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Are the rationals homeomorphic to any power of the rationals?
83
Is there a dense subset of the real plane with all pairwise distances rational?
44
Function with range equal to whole reals on every open set
43
Largest number of vectors with pairwise negative dot product
38
Finite nonabelian groups of odd order