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Jun
5
answered prime ideals, ring
May
8
answered Order of a group calculation
May
2
asked No normal subgroup of a subgroup of $S_n$ imply the subgroup is the one of even permutations or consists of two elements
May
2
answered Prove that $L_7$ is a subgroup of $S_7$
May
2
answered sylow p-subgroups of S3, S4 and S5
May
2
asked If $G$ acts non-trivially on a set then it has a proper normal subgroup of finite index
May
1
answered Is the intersection between a subgroup, and a normal subgroup, normal in the parent group?
May
1
asked Eigenvalues of $I-A^{t}A$ where $A$ is a semi orthogonal matrix
Apr
25
answered Topology without tears exercises 1.2 #6 i)
Apr
25
answered How to count algebraic multiplicities to show $\nexists$ an eigenbasis for $A$?
Apr
25
answered On convergent sequences
Apr
25
answered Prove that this set is open
Apr
24
asked Difference between definitions of $p$-subgroup and Sylow $p$-subgroup
Apr
24
answered Proving that $3^n<n!$ when $n\geq 7$
Apr
24
answered Where could (do?) we go after exhausting greek letters?
Apr
24
answered Eigen space of $T_{A}$ where $T_{A}(v)=Av$
Apr
24
answered Proving that if a set is both open and closed then it is equal to the real numbers
Apr
24
answered Classify $ \mathbb{Z}_9\times\mathbb{Z}_8\times\mathbb{Z}_8$/<(3,2,4)> according to the fundamental theorem of finitely generated abelian groups.
Apr
23
asked Subgroups of every order dividing the order of the group imply the group is abelian?
Apr
18
answered If $4=5$, then $6=8\,$ (yes or no?)