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awarded  Popular Question
Apr
29
accepted Don't understand the proof of Artin's “Algebra” Ed 1, Prop 5-8.4
Apr
29
comment Don't understand the proof of Artin's “Algebra” Ed 1, Prop 5-8.4
Thank you so much! Now I got it.
Apr
28
comment Don't understand the proof of Artin's “Algebra” Ed 1, Prop 5-8.4
I still don't get it. What you said is , for $s\in S_n$ and $\alpha \in Aut(S_n)$, let $s' = \alpha s$, then $s$ and $s'$ has the same order -- but why? Secondly, what Artin says is, if $s\in S_n$ and $t\in S_n$ has different order, then $s$ and $t$ will be in different orbit -- how could I reach this from your point?
Apr
28
revised Don't understand the proof of Artin's “Algebra” Ed 1, Prop 5-8.4
added 3 characters in body
Apr
28
asked Don't understand the proof of Artin's “Algebra” Ed 1, Prop 5-8.4
Apr
28
accepted How to define such a non-constant, continuous $f(x)$ on $[a,b] \subset \mathbb R$
Apr
23
revised How to define such a non-constant, continuous $f(x)$ on $[a,b] \subset \mathbb R$
edited title
Apr
23
revised How to define such a non-constant, continuous $f(x)$ on $[a,b] \subset \mathbb R$
added 12 characters in body; edited title
Apr
23
asked How to define such a non-constant, continuous $f(x)$ on $[a,b] \subset \mathbb R$
Apr
23
comment partition of a group and cosets
@DerekHolt I guess you comment has an typo at the end, "so $P_1 \le Ng$" might be "so $P_1 N \le Ng$"?
Apr
22
comment partition of a group and cosets
.... so $P_1 N \le Ng$? @DerekHolt
Oct
2
awarded  Notable Question
Aug
29
awarded  Popular Question
Jul
22
comment Fundamental Theorem of Linear Programming
@reuns let's say i got to make a living...
Jul
22
asked Fundamental Theorem of Linear Programming
Jul
16
asked IMO 2015 problem 2
Jul
10
awarded  Popular Question
May
18
accepted Why a form is positive only if its matrix in some ordered basis is a positive matrix?
May
18
answered Why a form is positive only if its matrix in some ordered basis is a positive matrix?