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Mathematics
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Plop
  • Member for 13 years, 11 months
  • Last seen more than 9 years ago
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11
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38
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Top posts
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45
How to prove $\cos \frac{2\pi }{5}=\frac{-1+\sqrt{5}}{4}$?
Oct 24, 2010
answer
31
thoughts about $f(f(x))=e^x$
Sep 19, 2011
answer
24
Prove that the limit of $\sin n$ as $n \rightarrow \infty$ does not exist
Mar 15, 2011
answer
21
What do prime ideals in $k[x,y]$ look like?
Aug 11, 2011
answer
17
Distinct Sylow $p$-subgroups intersect only at the identity, which somehow follows from Lagrange's Theorem. Why?
Mar 2, 2011
answer
15
Importance of Cayley's theorem
Nov 12, 2010
answer
14
Inequality involving factorial $\binom nk<(en/k)^k$
Jun 2, 2011
answer
14
Direct summand of a free module
Aug 17, 2011
answer
12
How to find the sum of the following series
Feb 4, 2011
answer
12
Hom of finitely generated modules over a noetherian ring
Nov 5, 2010
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30
Subspace of $L^2$ that lies in $L^\infty$
9
Question about computing group cohomology using cochains
6
Do there exist nonconstant functions such that...
6
How can we extend Galois representations ?
5
The normalizer of $\mathrm{GL}(n,\mathbf Z)$ in $\mathrm{GL}(n,\mathbf Q)$