Reputation
11,535
Next tag badge:
366/400 score
65/80 answers
Badges
3 41 87
Impact
~168k people reached

May
29
reviewed Close Sheaf of ideals
May
29
reviewed Close To prove this sequence does not contain a perfect square
May
28
comment On what sets can $\mathfrak{S}_n$ act transitively?
Calling this 'complete classification' is an overstatement, IMHO (just an equivalence of two classification problems).
May
27
reviewed Close Proof of an infinite series formula
May
27
reviewed Close $\exists \implies \forall$
May
27
reviewed Close find p,q to the expression A does not depend on x?
May
27
reviewed Leave Open What is the moduli space of lines in $\mathbb R^3$?
May
27
reviewed Reopen Find all functions $f$ such that if $a+b$ is a square, then $f(a)+f(b)$ is a square
May
27
comment Prove $\sum_{n= -\infty}^{\infty} \frac{1}{(t+n)^2} = \frac{\pi^2 }{\sin^2(\pi t)}$ using f(x)=1-|x| and Poisson summation formula
Related: Showing $\sum_{n=-\infty}^\infty \frac{1}{(z+n)^2}=\frac{\pi^2}{\sin^2(\pi z)}$ & $\sum\limits_{k = - \infty }^\infty {\frac{{{{\left( { - 1} \right)}^k}}}{{a + k}} = \frac{\pi }{{\sin \pi a}}} $
May
27
comment Spin manifold and the second Stiefel-Whitney class
@QiaochuYuan Sure (the only difference is the first sentences, essentially ;-)
May
26
revised Spin manifold and the second Stiefel-Whitney class
texified
May
26
answered Spin manifold and the second Stiefel-Whitney class
May
26
comment Spin manifold and the second Stiefel-Whitney class
Related: Which manifolds are parallelizable?
May
26
reviewed Leave Open Show that $f(x)=e^x$
May
26
reviewed Close Why does $ \frac {a}{b}$ of $c$ mean $ \frac {a}{b} \cdot c$
May
26
reviewed Close Elliptic curve over $\mathbb F_p$
May
25
comment Can one prove the existence of tensor product without explicitly constructing it?
Related: Existence proof of the tensor product using the Adjoint functor theorem
May
25
reviewed Close How to prove this identity
May
25
comment Different methods to prove $\zeta(s)=2^s\pi^{s-1}\sin\left(\frac{s\pi}{2}\right) \Gamma (1-s) \zeta (1-s)$.
Related: Contour approach to Riemann zeta functional equation
May
25
comment There does not exist a map $S^2\times S^2\to \mathbb{CP}^2$ with odd degree.
Related: Minimal Degree of map $S^2\times S^2\to \mathbb{CP}^2$