User José Figueroa-O'Farrill

41 votes

7 answers

4k views

Clifford algebra as an adjunction?

asked Dec 3, 2009 at 17:14

39 votes

5 answers

5k views

When does a ring surjection imply a surjection of the group of units?

asked Jul 12, 2010 at 3:05

37 votes

14 answers

5k views

What are interesting families of subsets of a given set?

asked Dec 30, 2009 at 7:15

33 votes

4 answers

7k views

Topology of function spaces?

asked Aug 11, 2010 at 0:51

33 votes

1 answer

4k views

Isometry group of a homogeneous space

asked Sep 18, 2011 at 12:25

31 votes

4 answers

4k views

Is "all categorical reasoning formally contradictory"?

asked May 5, 2010 at 10:16

30 votes

3 answers

5k views

When is a classification problem "wild"?

asked Jan 2, 2010 at 10:12

25 votes

2 answers

4k views

Are there Ricci-flat riemannian manifolds with generic holonomy?

asked Mar 2, 2010 at 2:50

22 votes

2 answers

2k views

"isotropic" subspaces of a simple Lie algebra

asked Oct 25, 2009 at 17:50

21 votes

3 answers

2k views

Invariants for the exceptional complex simple Lie algebra $F_4$

asked May 6, 2012 at 18:10

20 votes

1 answer

2k views

For which categories does one have a Goursat Lemma?

asked Nov 20, 2010 at 1:51

17 votes

2 answers

737 views

Are the associative grassmannian and the quaternionic projective plane diffeomorphic?

asked Apr 13, 2011 at 6:19

16 votes

1 answer

1k views

Is there an alternative characterisation of vector bundles with vanishing characteristic classes?

asked Feb 15, 2011 at 17:59

16 votes

2 answers

816 views

Spin structures on 7-dimensional spherical space forms

asked Dec 7, 2009 at 3:14

15 votes

3 answers

2k views

Hopf algebra structure on the universal enveloping algebra of a Leibniz algebra?

asked Oct 29, 2009 at 16:06

13 votes

2 answers

1k views

Ado's theorem for metric Lie algebras?

asked Aug 6, 2010 at 3:16

12 votes

4 answers

810 views

Type of 26-dimensional representation of different real forms of the complex simple Lie algebra $F_4$

asked May 4, 2012 at 12:51

12 votes

1 answer

564 views

Representations of degenerate Clifford algebras

asked Nov 23, 2018 at 14:43

11 votes

1 answer

483 views

3/4-Lie superalgebras: how much of a theory can one develop?

asked Oct 27, 2009 at 15:24

11 votes

2 answers

1k views

Is there a notion of integration over the algebraic numbers?

asked Apr 19, 2010 at 1:12

10 votes

2 answers

791 views

Is the category of representations of a finite W-algebra monoidal?

asked Jan 3, 2010 at 9:46

10 votes

6 answers

1k views

Is there a Morse theory for sections of bundles or more generally for maps?

asked Jan 26, 2010 at 12:48

10 votes

5 answers

2k views

What are some natural examples of "bimorphism" classes?

asked Aug 31, 2010 at 1:37

10 votes

2 answers

1k views

How to decompose a composition of representations?

asked Sep 14, 2010 at 17:10

10 votes

1 answer

377 views

Smooth vector fields on a surface modulo diffeomorphisms

asked Mar 9, 2019 at 16:25

10 votes

1 answer

484 views

Almost but not quite a Lie algebroid: what is it?

asked Jul 17, 2015 at 2:53

9 votes

3 answers

2k views

Lie group actions and f-relatedness

asked Jul 12, 2010 at 23:25

9 votes

6 answers

2k views

Lifting units from modulus n to modulus mn.

asked Jul 22, 2010 at 1:10

9 votes

0 answers

879 views

What is the origin of the formula for the Lie derivative along a Killing vector?

asked May 13, 2010 at 13:18

8 votes

1 answer

151 views

Criterion for existence of a homogeneous space associated to a Lie pair

asked Aug 1, 2018 at 0:35

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56 Questions

Clifford algebra as an adjunction?

When does a ring surjection imply a surjection of the group of units?

What are interesting families of subsets of a given set?

Topology of function spaces?

Isometry group of a homogeneous space

Is "all categorical reasoning formally contradictory"?

When is a classification problem "wild"?

Are there Ricci-flat riemannian manifolds with generic holonomy?

"isotropic" subspaces of a simple Lie algebra

Invariants for the exceptional complex simple Lie algebra $F_4$

For which categories does one have a Goursat Lemma?

Are the associative grassmannian and the quaternionic projective plane diffeomorphic?

Is there an alternative characterisation of vector bundles with vanishing characteristic classes?

Spin structures on 7-dimensional spherical space forms

Hopf algebra structure on the universal enveloping algebra of a Leibniz algebra?

Ado's theorem for metric Lie algebras?

Type of 26-dimensional representation of different real forms of the complex simple Lie algebra $F_4$

Representations of degenerate Clifford algebras

3/4-Lie superalgebras: how much of a theory can one develop?

Is there a notion of integration over the algebraic numbers?

Is the category of representations of a finite W-algebra monoidal?

Is there a Morse theory for sections of bundles or more generally for maps?

What are some natural examples of "bimorphism" classes?

How to decompose a composition of representations?

Smooth vector fields on a surface modulo diffeomorphisms

Almost but not quite a Lie algebroid: what is it?

Lie group actions and f-relatedness

Lifting units from modulus n to modulus mn.

What is the origin of the formula for the Lie derivative along a Killing vector?

Criterion for existence of a homogeneous space associated to a Lie pair