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Lie Groups are Groups that are additionally smooth manifolds such that the multiplication and the inverse maps are smooth.

3 votes
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Closed subgroups of $Tr_1(d,\mathbb{Q}_p)$

Pick $\lambda \in \mathbb{Z}_p \backslash \mathbb{Q}$ and define $H = \left\lbrace\begin{pmatrix} 1 & 0 & a \cr 0 & 1 & \lambda a \cr 0 & 0 & 1 \end{pmatrix} : a \in \mathbb{Z}_p\right\rbrace$. Th …
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4 votes

Borel–Weil theorem - reference request

Chapter II.5 in Jantzen's Representations of Algebraic Groups offers an algebraic treatment of this theorem.
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7 votes

What would you want on a Lie theory cheat poster?

Description of the fibres of the Springer resolution. Classification of nilpotent orbits.
2 votes
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Lower bound on the degree of a product of elements in a hyperalgebra/enveloping algebra

I don't have a full answer, but the following calculation may be useful. Consider the example $G = SL_3$ so that $N$ is the Heisenberg group on three generators and in characteristic zero, $\bar{U}(N …
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