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 Yearling
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May
21
asked A question about a property of Gauss sum.
May
15
comment The maps $\delta: V \to B \otimes V$ and $\delta': V \otimes V^* \to B$.
@NajibIdrissi, yes, I think that if we have $\delta$, then $\delta'$ can be defined as $\delta'(f, g^*) = <f_{(1)}, g^*> f_{(0)}$, where $\delta(f) = \sum f_{(0)} \otimes f_{(1)}$.
May
15
revised The maps $\delta: V \to B \otimes V$ and $\delta': V \otimes V^* \to B$.
added 1 character in body
May
15
comment The maps $\delta: V \to B \otimes V$ and $\delta': V \otimes V^* \to B$.
@NajibIdrissi, thank you very much. Yes, $B$ should be a coalgebra. I will edit the post.
May
15
asked The maps $\delta: V \to B \otimes V$ and $\delta': V \otimes V^* \to B$.
May
7
comment Decomposition of standard Borel subgroup.
Now I understand. The matrices in M, N satisfy the property: ${}^t \bar{g}Sg=S$.
May
7
asked Why $\int_{U} d(m n m^{-1}) = \int_{mUm^{-1}} dn = \omega^2_E(t_1) \int_U dn$?
May
7
revised Decomposition of standard Borel subgroup.
added 304 characters in body
May
7
comment Decomposition of standard Borel subgroup.
thank you very much. Why the diagonal matrices $A$ in $M$ satisfies the property: $A_{33} = \bar{A}_{11}^{-1}$ ($A$ is not arbitrary diagonal matrix)?
May
7
accepted Decomposition of standard Borel subgroup.
May
6
asked Decomposition of standard Borel subgroup.
May
6
accepted Why $\ker N_{E/F}$ is a map from $E^{\times}$ to $F^{\times}$?
May
6
asked Why $\ker N_{E/F}$ is a map from $E^{\times}$ to $F^{\times}$?
May
5
comment What's the meaning of $d^{\times } a$?
@PeterHumphries, thank you very much.
May
3
revised What's the meaning of $d^{\times } a$?
deleted 52 characters in body
May
3
asked What's the meaning of $d^{\times } a$?
May
1
asked Definition of a matrix by using coaction.
Apr
25
revised Why the orbit is of dimension $12$?
deleted 16 characters in body
Apr
19
awarded  Yearling
Apr
18
asked Questions about strata of a variety: the nilpotent cone of $\mathfrak{sl}_2$.