Mikko Korhonen
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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