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2d
comment The number of elements which are squares in a finite field.
@Sarien: Then we are in characteristic $2$, so $x^2 = y^2$ implies $(x-y)^2 = 0$ implies $x = y$.
Apr
25
awarded  Nice Question
Apr
24
awarded  Enlightened
Apr
24
awarded  Nice Answer
Apr
23
answered Square of order of a Sylow p-subgroup in the nonabelian simple groups
Apr
21
comment Main branches of mathematics
@paulpaul1076: Seems like it's no longer hosted. However, I think most of the content can still be found through the internet archive.
Apr
21
revised Main branches of mathematics
added 198 characters in body
Apr
19
awarded  Good Answer
Apr
3
comment showing that ${kp^2\choose jp^2} \equiv {k\choose j}$ modulo $p$
en.wikipedia.org/wiki/Lucas'_theorem
Mar
23
comment For which numbers $n$ does every group with order $n$ have a non-trivial center?
math.stackexchange.com/questions/1569214/…
Mar
9
answered For which numbers $n$ is every group of order $n$ nilpotent?
Feb
2
awarded  Enlightened
Feb
2
awarded  Nice Answer
Jan
30
comment What dihedral subgroups occur in the affine general linear group $AGL(2,3)$
G := AutomorphismGroup(SylowSubgroup(GL(3,3),3));; L := List(ConjugacyClassesSubgroups(G), StructureDesription(Representative)));
Jan
30
comment What dihedral subgroups occur in the affine general linear group $AGL(2,3)$
According to GAP, you can also find the dihedral group of order $12$.
Jan
30
comment Is $SL_n(\mathbb{R})$ actually simple?
See eg "Classical Groups and Geometric Algebra" by Grove. This result is proved in the beginning of the book.
Jan
28
answered Group conjecture
Jan
16
answered When is every group of order $n$ nilpotent of class $\leq c$?
Dec
10
answered How many groups of order $n$ with center {e} exist?
Nov
13
awarded  Popular Question