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I study representation theory, mathematical physics.


8h
accepted How to compute $U \cap wUw^{-1}$?
2d
asked How to compute $U \cap wUw^{-1}$?
2d
comment Factorization of unipotent groups.
@Shaun, I don't understand much about $U_P$ and $L_P$. For example, let $$ P = \left( \begin{matrix} * & * & 0 & 0 \\ * & * & 0 & 0 \\ * & * & * & * \\ * & * & * & * \end{matrix} \right) $$. What is $U_P$ and $L_P$? Thank you very much.
2d
asked Factorization of unipotent groups.
2d
revised Solve a system of equations.
added 101 characters in body
2d
answered Solve a system of equations.
Jul
8
asked Solve a system of equations.
Jul
6
reviewed Approve suggested edit on $2^{1/4} \times 4^{1/8} \times 8^{1/16} \times 16^{1/32} \times \ldots\to2$
Jul
6
revised Why $\rho(t)^{-1}(H-\frac{\partial}{\partial h_{\rho^{\vee}}}) \rho(t) = H - \frac{1}{2}(\rho^{\vee}, \rho^{\vee})$?
added 317 characters in body
Jul
6
asked Why $\rho(t)^{-1}(H-\frac{\partial}{\partial h_{\rho^{\vee}}}) \rho(t) = H - \frac{1}{2}(\rho^{\vee}, \rho^{\vee})$?
Jul
4
comment Why exponential function on p-adic numbers is meaningless?
@KCd, thank you very much for your help.
Jul
2
awarded  Socratic
Jul
2
awarded  Curious
Jul
2
awarded  Inquisitive
Jun
30
accepted What is the explicit formula for classical r-matrices?
Jun
24
reviewed Approve suggested edit on Associative ring with identity, inverses, divisors of zero and Artinianity
Jun
24
reviewed Approve suggested edit on Limits in vector calc
Jun
24
comment What does it mean an isomorphism of a Dynkin diagram induced by some $w \in W$.
maybe we can also think it corresponds to $S_4$? The vertices of the Dynkin diagram corresponds to the set $\{1,2,3,4\}$ and $\phi$ corresponds to $(1,2,3,4) \mapsto (4,3,2,1)$.
Jun
24
accepted What does it mean an isomorphism of a Dynkin diagram induced by some $w \in W$.
Jun
24
reviewed Approve suggested edit on What are the members of the set $A=7^{n}+5^{n}(mod35)$