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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.