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Jul
26
asked How is the Fourier transform a geneeralization the the Fourier series?
Jul
24
answered Notation of an infinite union
Jul
16
answered If $a^n=e$ for exactly one $a$ then show that $a\in Z(G)$
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