5,082 reputation
21143
bio website
location
age
visits member for 2 years, 7 months
seen 5 hours ago

I'm deeply impressed by mathematics.


Sep
30
awarded  Explainer
Sep
24
awarded  Autobiographer
Sep
21
comment Presentation of a group: Show that $\langle a|a^2\rangle =\{1,a\}$.
Ya, I will work hard, thanks for your help.
Sep
20
comment Presentation of a group: Show that $\langle a|a^2\rangle =\{1,a\}$.
So what exactly $\{N,Na\}$ is? Is it $\{\{1,a^{\pm2},a^{\pm4},...\},\{a^{\pm1},a^{\pm3},a^{\pm5},..\}\}$?
Sep
20
awarded  Notable Question
Sep
20
comment Presentation of a group: Show that $\langle a|a^2\rangle =\{1,a\}$.
$\{N,Na\}=F$?????
Sep
20
comment Presentation of a group: Show that $\langle a|a^2\rangle =\{1,a\}$.
So $N=\{1,a^{\pm 2},a^{\pm 4},...\}$?
Sep
20
revised Presentation of a group: Show that $\langle a|a^2\rangle =\{1,a\}$.
added 213 characters in body
Sep
20
revised Presentation of a group: Show that $\langle a|a^2\rangle =\{1,a\}$.
deleted 1 character in body
Sep
20
asked Presentation of a group: Show that $\langle a|a^2\rangle =\{1,a\}$.
Sep
14
awarded  Notable Question
Sep
10
awarded  Tumbleweed
Sep
8
asked Let $H$ be subgroup of $G$, $a,b\in G$, how that $Ha=Hb$ iff $ab^{-1}\in H$.
Sep
3
comment Problem about compact subspace of Hilbert cube.
Thank you for your help~
Sep
3
asked Problem about Jacobian of quadratic and linear form.
Sep
1
comment Problem about compact subspace of Hilbert cube.
So $(X_i,\tau_i)$ are compact subspace of compact space? How can I proceed?
Aug
31
asked Problem about compact subspace of Hilbert cube.
Aug
31
accepted Connectedness and non-local-connectedness of a subspace of $\mathbb R^2$
Aug
27
accepted Countable product of closed set is closed?
Aug
27
asked Countable product of closed set is closed?