User Simon Lentner

20 votes

2 answers

1k views

(weak?) BN-Pair / Tits System for Sporadic Groups

asked Apr 7, 2012 at 21:05

13 votes

1 answer

411 views

Chiral homology for the Virasoro algebra and/or affine Lie algebra

asked Jan 11, 2021 at 15:51

10 votes

1 answer

302 views

Finite subgroups of Lie group over algebraic ring of integers

asked Mar 17, 2017 at 18:08

9 votes

1 answer

1k views

Correlation-Function for Random Graph Ising Model

asked Apr 11, 2012 at 13:12

9 votes

5 answers

2k views

Highly symmetric 6-regular graph with 20 vertices

asked Apr 6, 2012 at 23:28

6 votes

1 answer

221 views

Liftings of Nichols algebras over racks via Doi twist

asked Apr 7, 2012 at 19:06

6 votes

1 answer

231 views

Dimension formula for Cartan-type abelian.group Nichols algebra?

asked Apr 20, 2012 at 18:42

6 votes

1 answer

278 views

Homotopy groups of Diffeomorphisms of punctured d-dim ball

asked Feb 23, 2019 at 8:37

5 votes

2 answers

1k views

symmetric 2-cocycle / many projective representations

asked Feb 4, 2015 at 11:08

5 votes

0 answers

242 views

Which properties of the pullback/restriction functor imply surjectivity of a ring homomorphism

asked Jan 21, 2023 at 21:48

4 votes

0 answers

112 views

The semiclassical limit of Virasoro reps $\varphi_{n,1}$ produces certain $\mathfrak{sl}_2$ reps — what is the connection to KdV?

asked Aug 13, 2021 at 11:08

4 votes

1 answer

242 views

Closest point to a dual lattice point (in particular for root lattices!)

asked Nov 18, 2015 at 4:11

4 votes

1 answer

193 views

Bigalois Groupoid Of Drinfel'd Group Double

asked Jul 8, 2012 at 21:51

3 votes

0 answers

117 views

Multiple Number Partitioning / "Multiprocessor Scheduling"

asked Mar 15, 2013 at 16:52

3 votes

1 answer

377 views

Spin structure for varieties, especially finite field

asked Jun 20, 2016 at 19:35

3 votes

0 answers

71 views

Conjugacy classes in reductive group under adjoint action of parabolic subgroup

asked May 30, 2020 at 8:40

3 votes

0 answers

100 views

Historical appearance of using $\operatorname{SO}_3$-representation theory for spherical harmonics

asked Nov 7 at 23:50

3 votes

0 answers

147 views

Parallel transport for variety over finite field

asked Jul 9, 2018 at 17:58

2 votes

0 answers

68 views

2-cocycles/Bigalois-objects over nontrivial liftings

asked May 15, 2012 at 17:45

2 votes

1 answer

209 views

Simplicial complex made of central idempotents of an algebra

asked Apr 12, 2012 at 12:35

1 vote

0 answers

91 views

Ext-Ring of (equivariant) sheaves over a variety

asked Jun 16, 2020 at 14:31

1 vote

0 answers

81 views

Feynman rule in finite volume or at periodic boundary condition

asked Aug 29, 2020 at 12:55

1 vote

1 answer

160 views

Example of tensor category with non-simple unit $J\to \mathbb{1} \to Q$ and suitably extension $Q\to M\to J$

asked Jul 5, 2018 at 21:24

Stack Exchange Network

23 Questions

(weak?) BN-Pair / Tits System for Sporadic Groups

Chiral homology for the Virasoro algebra and/or affine Lie algebra

Finite subgroups of Lie group over algebraic ring of integers

Correlation-Function for Random Graph Ising Model

Highly symmetric 6-regular graph with 20 vertices

Liftings of Nichols algebras over racks via Doi twist

Dimension formula for Cartan-type abelian.group Nichols algebra?

Homotopy groups of Diffeomorphisms of punctured d-dim ball

symmetric 2-cocycle / many projective representations

Which properties of the pullback/restriction functor imply surjectivity of a ring homomorphism

The semiclassical limit of Virasoro reps $\varphi_{n,1}$ produces certain $\mathfrak{sl}_2$ reps — what is the connection to KdV?

Closest point to a dual lattice point (in particular for root lattices!)

Bigalois Groupoid Of Drinfel'd Group Double

Multiple Number Partitioning / "Multiprocessor Scheduling"

Spin structure for varieties, especially finite field

Conjugacy classes in reductive group under adjoint action of parabolic subgroup

Historical appearance of using $\operatorname{SO}_3$-representation theory for spherical harmonics

Parallel transport for variety over finite field

2-cocycles/Bigalois-objects over nontrivial liftings

Simplicial complex made of central idempotents of an algebra

Ext-Ring of (equivariant) sheaves over a variety

Feynman rule in finite volume or at periodic boundary condition

Example of tensor category with non-simple unit $J\to \mathbb{1} \to Q$ and suitably extension $Q\to M\to J$