Grigory M
Reputation
11,535
366/400 score
 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 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 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? May 25 reviewed Close How to prove this identity May 25 comment Different methods to prove $\zeta(s)=2^s\pi^{s-1}\sin\left(\frac{s\pi}{2}\right) \Gamma (1-s) \zeta (1-s)$. May 25 comment There does not exist a map $S^2\times S^2\to \mathbb{CP}^2$ with odd degree.