User Bugs Bunny

4 votes

Is there a canonical Hopf structure on the center of a universal enveloping algebra?

answered Apr 3, 2010 at 9:53

4 votes

Are supervector spaces the representations of a Hopf algebra?

answered Apr 1, 2010 at 12:03

4 votes

Accepted

Why are polynomials easier to handle with than integers?

answered Oct 29, 2010 at 11:19

4 votes

Accepted

local Artin algebras

answered Oct 27, 2010 at 23:28

4 votes

Algebraic geometry

answered Oct 17, 2010 at 7:45

4 votes

how to recognize subgroups through Dynkin diagram?

answered Oct 1, 2010 at 13:53

4 votes

An algebra which is a direct sum of simple sub-bimodules over a subalgebra

answered Jun 13, 2021 at 15:44

4 votes

Representations are determined by characters : Groups and Lie algebras

answered Jan 3, 2020 at 16:52

4 votes

Non-cosemisimple duals of pointed Hopf algebras

answered Mar 10, 2021 at 20:10

4 votes

Accepted

Isometry type of alcoves in affine Coxeter complexes

answered Mar 26, 2020 at 13:49

3 votes

Accepted

Examples of strict monoidal categories and monoidal categories with nontrivial associators

answered Mar 29, 2020 at 8:35

3 votes

Real representations of SO(n) and U(n)

answered Apr 2, 2020 at 6:33

3 votes

Accepted

Is a smallness condition necessary in the Tannaka reconstruction theorem?

answered Nov 25, 2021 at 12:11

3 votes

Accepted

Tannakian fundamental group of automorphic representations

answered Nov 25, 2021 at 17:33

3 votes

Accepted

Left-right non-bimodule examples

answered Jan 6, 2020 at 11:58

3 votes

Accepted

When is $\mathcal{D}(\mathcal{F}):\mathcal{D}(\mathcal{A})\to \mathcal{D}(\mathcal{B})$ fully faithful?

answered Jan 13, 2020 at 20:07

3 votes

Dixmier's lemma as a generalisation of Schur's first lemma

answered Jul 26, 2019 at 7:54

3 votes

What's an illustrative example of a tame algebra?

answered Feb 14, 2020 at 13:14

3 votes

Accepted

The Lie algebra of the subgroup of $GL(n)$ preserving a given variety

answered Mar 23, 2020 at 7:05

3 votes

Accepted

Semidirect product of metaplectic group and Heisenberg group

answered Mar 24, 2020 at 6:05

3 votes

Accepted

Irreducibility of product bicomodules

answered Apr 14, 2020 at 4:53

3 votes

Introduction to W-Algebras/Why W-algebras?

answered Apr 23, 2021 at 6:54

3 votes

Elementary reference for algebraic groups

answered Sep 28, 2010 at 8:13

3 votes

Projectivity of free O_X modules with respect to the sheafy hom?

answered Oct 31, 2010 at 19:03

3 votes

When is there a $g$-module isomorphism between a semi-simple Lie algebra $g$ and an exterior power of its standard representation?

answered Sep 16, 2010 at 14:47

3 votes

Accepted

Sub-representations of the affine group

answered Jun 30, 2010 at 11:44

3 votes

Which is the correct universal enveloping algebra in positive characteristic?

answered Apr 1, 2010 at 12:44

3 votes

What finite group schemes can act freely on a rational function field in one variable?

answered Apr 6, 2010 at 10:11

3 votes

Accepted

Computing a set of coset representatives for $\mathbb{Z}^n / \Lambda$

answered May 12, 2010 at 9:01

3 votes

Kähler structure on cotangent bundle?

answered Jun 2, 2010 at 9:46

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191 Answers

Is there a canonical Hopf structure on the center of a universal enveloping algebra?

Are supervector spaces the representations of a Hopf algebra?

Why are polynomials easier to handle with than integers?

local Artin algebras

Algebraic geometry

how to recognize subgroups through Dynkin diagram?

An algebra which is a direct sum of simple sub-bimodules over a subalgebra

Representations are determined by characters : Groups and Lie algebras

Non-cosemisimple duals of pointed Hopf algebras

Isometry type of alcoves in affine Coxeter complexes

Examples of strict monoidal categories and monoidal categories with nontrivial associators

Real representations of SO(n) and U(n)

Is a smallness condition necessary in the Tannaka reconstruction theorem?

Tannakian fundamental group of automorphic representations

Left-right non-bimodule examples

When is $\mathcal{D}(\mathcal{F}):\mathcal{D}(\mathcal{A})\to \mathcal{D}(\mathcal{B})$ fully faithful?

Dixmier's lemma as a generalisation of Schur's first lemma

What's an illustrative example of a tame algebra?

The Lie algebra of the subgroup of $GL(n)$ preserving a given variety

Semidirect product of metaplectic group and Heisenberg group

Irreducibility of product bicomodules

Introduction to W-Algebras/Why W-algebras?

Elementary reference for algebraic groups

Projectivity of free O_X modules with respect to the sheafy hom?

When is there a $g$-module isomorphism between a semi-simple Lie algebra $g$ and an exterior power of its standard representation?

Sub-representations of the affine group

Which is the correct universal enveloping algebra in positive characteristic?

What finite group schemes can act freely on a rational function field in one variable?

Computing a set of coset representatives for $\mathbb{Z}^n / \Lambda$

Kähler structure on cotangent bundle?