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 Apr 25 awarded Yearling Apr 11 awarded Nice Question Feb 21 reviewed Leave Open Prove or disprove: If $n^3$ is odd then $n$ is odd. Feb 21 reviewed Edit A retraction of a residually finite group is separable Feb 21 revised A retraction of a residually finite group is separable added 3 characters in body Feb 21 reviewed Close Subgroup of $S_n$ with elements having cycles of any possible length Dec 17 reviewed Leave Open Decide if a stack of overhanging blocks is stable Dec 17 reviewed Leave Open Find dimension and tangent space of manifold $M = \{(p_1,p_2,p_3)\in \mathbb{R^3}: p_1^2-p_2^2+p_1p_3-2p_2p_3=0, 2p_1-p_2+p_3=3\}$ Dec 17 reviewed Approve find the relation between $A$ and $G$. Nov 25 comment Sheaf of regular functions Actually, that (the second paragraph) was the way I wanted to define the regular function but thought I lacked space in the comments. Thanks for the answer though! Nov 25 accepted Sheaf of regular functions Nov 25 comment Sheaf of regular functions @MarianoSuárez-Alvarez There is only one function $\emptyset\to k$. A regular function on $U$ is a rational function that is well-defined at all points of $U$. Nov 25 comment Sheaf of regular functions @EricWofsey i'm taking it to be irreducible. Nov 25 revised Sheaf of regular functions added 98 characters in body Nov 25 comment Sheaf of regular functions @EricWofsey $X$ is an affine variety. $O_X$ is the set of rings $O_X(U)$ of regular functions on open subsets of $X$. Sorry for the confusion Nov 25 revised Sheaf of regular functions added 33 characters in body Nov 25 asked Sheaf of regular functions Nov 24 accepted Chinese Remainder theorem on Elliptic Curve group Nov 24 reviewed Reject Modulo arithmetic with big numbers? Apr 28 reviewed Leave Open showing that $\Phi:\Pi_{1}(X,x_{0})\rightarrow [S^{1},X]$ is onto if $X$ is path connected.