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visits member for 1 year, 2 months
seen Mar 5 at 4:42

Feb
12
awarded  Nice Answer
Jan
29
awarded  Yearling
Sep
12
accepted Maximal abelian subgroups in a $p$-group are always normal?
Sep
12
comment Maximal abelian subgroups in a $p$-group are always normal?
thanks, I didn't realise it was so simple.
Sep
11
comment Maximal abelian subgroups in a $p$-group are always normal?
@DonAntonio, yeah, I am assuming the $p$-group is finite. But I am talking about maximal among abelian subgroups, not just maximal among any subgroups.
Sep
11
asked Maximal abelian subgroups in a $p$-group are always normal?
Aug
5
comment $ \frac {dy}{dx} \sin y = (1-x\cos y)\cos y$
Hint: $\sin ydy=-d\cos y$.
Jul
31
asked How to choose the adjacency set
Jul
22
comment Are these 2 graphs isomorphic?
@MarkMcClure, do you know this kind of animation is available by tex coding or not?
Jul
22
answered Group Theory Normal Subgroups
Jul
21
comment Solving $x^2-7[x]+5=0.$ to find values of $x$.
Hint: find the intersection of $y=x^2+5$ and $y=7[x]$.
Jul
15
comment Splitting an electricity bill
I suggest to assume every equal length period consumes the same amount of electricity. We know there are a lot of electric facilities consume the same amount of electricity regardless of the number of tenancy. For example, fridge, tv, heater, etc. More people just means more usage on the light bulbs in their own rooms, maybe?
Jul
9
comment What is the structure of the Coxeter groups of type $\text{D}_n$
@JyrkiLahtonen, sorry, I still don't quite get it. For example, where $\sigma_2\circ\sigma_n$ is mapped to? And why $|ker f|=2^{n-1}$ but not $2^{n\choose 2}$?
Jul
9
comment What is the structure of the Coxeter groups of type $\text{D}_n$
@TobiasKildetoft, by the base group I meant $\mathbb{Z}_2^{n-1}$.
Jul
9
comment What is the structure of the Coxeter groups of type $\text{D}_n$
@TobiasKildetoft, yeah, I guess it is something like what you say. I believe $H=S_n$. But what are elements in the base group?
Jul
9
revised What is the structure of the Coxeter groups of type $\text{D}_n$
added 9 characters in body
Jul
9
asked What is the structure of the Coxeter groups of type $\text{D}_n$
Jun
17
comment a problem on permutation group and normal subgroup
Hint: Think about how a conjugation acts on an element.
Jun
12
revised Constructing automorphisms
added 55 characters in body
Jun
12
revised Constructing automorphisms
added 380 characters in body