User Jim Humphreys

5 votes

unipotent class in classical lie algebra bala-carter

answered Mar 26, 2017 at 0:05

5 votes

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When does the tensor product of two irreps contain the adjoint representation?

answered Mar 28, 2017 at 16:11

5 votes

Signs in Chevalley's commutator formula

answered Mar 30, 2016 at 18:31

5 votes

structure of maximal tori in semisimple algebraic groups

answered Apr 17, 2016 at 14:01

5 votes

Projectives in the category of modular representations of Lie algebras

answered Jul 14, 2016 at 17:31

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Is there a formula for the Frobenius-Schur indicator of a rep of a Lie group?

answered Jan 12, 2016 at 0:51

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Inverse Galois problem for simple Lie type groups

answered Oct 3, 2015 at 17:24

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Explicit construction of an element of ${\rm GL}(2, p)$ of order $p+1$

answered Dec 3, 2015 at 19:16

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Maximal torus of Chevalley group $Sp(4)$

answered Dec 4, 2015 at 17:12

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Structure of Deligne-Lusztig representations $R_{T,\theta}$ for ministropic $T$ and cuspidal representations

answered Oct 8, 2015 at 14:15

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Conjugacy of Regular Semisimple Subalgebras

answered Dec 22, 2017 at 15:54

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Module with indecomposable and decomposable reductions mod $p$

answered Oct 19, 2017 at 14:16

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Recursive formula for inverse Kazhdan-Lusztig polynomials

answered Feb 28, 2018 at 21:52

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Is the tensor product of two infinite dimensional objects in the BGG category $\mathcal{O}$ of a semisimple Lie algebra always not in $\mathcal{O}$?

answered Sep 17, 2019 at 21:27

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History of the study of Verma modules in terms of Kazhdan Lusztig Theory

answered Oct 6, 2019 at 2:16

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Reference Request: Structure constants for G2

answered Feb 10, 2019 at 15:12

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Existence of a weight of a representation in the fundamental Weyl chamber

answered May 7, 2019 at 12:27

4 votes

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Distance between Verma modules in certain "strongly" standard filtrations

answered May 27, 2019 at 20:01

4 votes

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Conjugacy classes of symplectic group $\mathrm{Sp}(4,q)$

answered Feb 6, 2019 at 21:40

4 votes

Indecomposable, non-simple, modules of quantum groups at roots of unity

answered Apr 25, 2019 at 21:27

4 votes

Problem based representation theory book

answered Apr 28, 2019 at 20:14

4 votes

Diagonal automorphisms for twisted Chevalley groups

answered Sep 22, 2019 at 2:26

4 votes

Questions about categorification (& combinatorial simplification of the Russian approach to Lusztig's conjectures, in zero & positive characteristic)

answered Mar 31, 2018 at 15:59

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Generalizing Polar Decomposition of Matrices

answered Oct 13, 2018 at 14:45

4 votes

Folding by Automorphisms

answered Jun 13, 2017 at 22:47

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Length of Weyl group element mapping highest root to a simple root

answered Nov 6, 2015 at 14:25

4 votes

Parahoric Group Scheme

answered Sep 20, 2015 at 14:24

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Fundamental invariants for root subsystems

answered Oct 28, 2015 at 23:43

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Simple lie algebras, (almost-)simple groups of Lie type

answered Feb 16, 2016 at 23:31

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Characterizations of Jacobson-Morozov parabolics associated to a nilpotent

answered Jul 25, 2015 at 18:02

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704 Answers

unipotent class in classical lie algebra bala-carter

When does the tensor product of two irreps contain the adjoint representation?

Signs in Chevalley's commutator formula

structure of maximal tori in semisimple algebraic groups

Projectives in the category of modular representations of Lie algebras

Is there a formula for the Frobenius-Schur indicator of a rep of a Lie group?

Inverse Galois problem for simple Lie type groups

Explicit construction of an element of ${\rm GL}(2, p)$ of order $p+1$

Maximal torus of Chevalley group $Sp(4)$

Structure of Deligne-Lusztig representations $R_{T,\theta}$ for ministropic $T$ and cuspidal representations

Conjugacy of Regular Semisimple Subalgebras

Module with indecomposable and decomposable reductions mod $p$

Recursive formula for inverse Kazhdan-Lusztig polynomials

Is the tensor product of two infinite dimensional objects in the BGG category $\mathcal{O}$ of a semisimple Lie algebra always not in $\mathcal{O}$?

History of the study of Verma modules in terms of Kazhdan Lusztig Theory

Reference Request: Structure constants for G2

Existence of a weight of a representation in the fundamental Weyl chamber

Distance between Verma modules in certain "strongly" standard filtrations

Conjugacy classes of symplectic group $\mathrm{Sp}(4,q)$

Indecomposable, non-simple, modules of quantum groups at roots of unity

Problem based representation theory book

Diagonal automorphisms for twisted Chevalley groups

Questions about categorification (& combinatorial simplification of the Russian approach to Lusztig's conjectures, in zero & positive characteristic)

Generalizing Polar Decomposition of Matrices

Folding by Automorphisms

Length of Weyl group element mapping highest root to a simple root

Parahoric Group Scheme

Fundamental invariants for root subsystems

Simple lie algebras, (almost-)simple groups of Lie type

Characterizations of Jacobson-Morozov parabolics associated to a nilpotent