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Oct
19
awarded  Yearling
Oct
19
awarded  Commentator
Oct
19
comment The structure of groups (p-groups) in which the centralizer of any non-central element is cyclic
See mathoverflow.net/questions/128841/….
Oct
19
answered Importance of $2$-groups in Finite Simple Groups
Oct
19
awarded  Critic
Oct
18
answered p-adic density of zeroes of a polynomial
Oct
17
comment Cardinality of the linear group $GL_n({\mathbb Z}/{p \mathbb Z})$
Yes, since you are considering vectors in the space $(\mathbb Z / p \mathbb Z)^n$ over $\mathbb Z / p \mathbb Z$.
Oct
17
answered I want search that there is a $ y \in Q_{8} $ such that $ Q_{8} = \langle y \rangle Z(Q_{8}) $.
Oct
17
answered Cardinality of the linear group $GL_n({\mathbb Z}/{p \mathbb Z})$
Oct
17
comment When is $2^n +3^n + 6^n$ a perfect square?
Also, $n$ must be $2$ modulo $4$ (use mod $5$).
Oct
17
answered How to classify the alternating group of degree n
Oct
16
awarded  Informed
Oct
16
comment Trace form to Frobenius norm
Are you trying to maximize the trace with a fixed $H$ or $A$?
Oct
15
answered Showing that $A_{\infty}$ is a simple group.
Oct
15
comment Convergence of cos, sin, tan functions
No, $0$ is also repelling. The reason for this is because $0$ is a saddle point for $tan$. As I wrote, a picture is worth a thousand words here.
Oct
15
comment Convergence of cos, sin, tan functions
Yes. All fixed points (except for $0$) are repelling, because the derivative there is greater than $1$. With $0$, you have to be a bit more careful.
Oct
15
answered Convergence of cos, sin, tan functions
Oct
13
comment Direct sum of Prüfer groups and $\mathbb Q/\mathbb Z$
Look up profinite completions and Pontryagin duality.
Sep
15
comment Inequality: $7a+5b+12ab\le9$
Think geometry.
Sep
15
comment Intersection of distinct maximal subgroups in a finite simple group
More is true: If every proper subgroup of a finite group is nilpotent, then the group is solvable. This is the Schmidt-Iwasawa theorem.