User Saal Hardali

11 votes

2 answers

882 views

From Weyl groups to Weyl groupoids?

asked Apr 30, 2016 at 13:06

11 votes

1 answer

812 views

Understanding the purely formal part of the sheaf theoretic (cohomological) framework for representation theory

asked Jul 21, 2016 at 16:07

11 votes

0 answers

552 views

The intrinsic meaning of abelian sheaf cohomology of a category

asked Feb 15, 2017 at 23:47

10 votes

0 answers

264 views

Is there a classification of differential equations over the field of fractions of formal power series? (characteristic 0)

asked Dec 15, 2016 at 0:01

10 votes

0 answers

409 views

Higher Adeles of a scheme and related topics

asked Jan 20, 2017 at 16:08

10 votes

0 answers

343 views

What are the analogs of a Levi/Parabolic/Borel/Bruhat over the field with 1 element?

asked Dec 25, 2017 at 13:08

10 votes

2 answers

404 views

A finite group $G$ all of whose reps are defined over $\mathbb{Z}$ and yet $Rep(G)$ is not generated by permutation representations

asked Jul 2, 2019 at 7:47

10 votes

1 answer

387 views

Is every endomorphism of the sheaf of holomorphic functions on a disk a differential operator?

asked Feb 19, 2018 at 8:33

9 votes

0 answers

273 views

About an algebraic construction of a sheaf of formal microdifferential operators

asked Nov 1, 2017 at 15:05

9 votes

2 answers

613 views

When is a formal deformation convergent?

asked Mar 19, 2018 at 21:30

9 votes

0 answers

507 views

Categorification of definitions in the context of the derived category of quasi-coherent sheaves

asked Jan 24, 2017 at 19:50

9 votes

1 answer

1k views

Geometric construcion of Proj as a quotient by a $\mathbb{G}_m$ action

asked May 9, 2016 at 14:20

9 votes

2 answers

583 views

Simplest explicit counterexample for $Vect(BG) \ne Rep(G)$ as monoids

asked May 9, 2016 at 19:11

9 votes

1 answer

847 views

Algebro-geometric version of {vector fields} $\longleftrightarrow$ {flows} correspondence?

asked May 23, 2016 at 15:08

9 votes

0 answers

378 views

Is there any notion of "smoothification" from $\mathbb{R}$-schemes to generalized smooth spaces?

asked Apr 19, 2016 at 22:33

9 votes

1 answer

805 views

Is the analytification functor part of a geometric morphism of topoi?

asked Apr 7, 2016 at 7:39

9 votes

1 answer

327 views

Closed formulas for topological K-theory?

asked Apr 7, 2016 at 20:39

8 votes

1 answer

710 views

Simple characterization of Postnikov & Whitehead towers?

asked Jan 27, 2017 at 11:10

8 votes

1 answer

698 views

Interactions (functors) between equivariant sheaves for different groups?

asked Apr 3, 2017 at 13:35

8 votes

1 answer

615 views

Functorial construction of ("pre"-)spectral sequences? (Or - what is the "higher structure" underlying spectral sequences?)

asked Aug 19, 2017 at 16:28

8 votes

1 answer

976 views

Homotopy theoretic description of homotopy fixed points (and obstructions) for an action of group $G$ on a groupoid $X$

asked Sep 7, 2017 at 22:07

8 votes

3 answers

859 views

What does the flow of the principal symbol of the differential operator tell us about the PDE?

asked Mar 23, 2018 at 18:31

8 votes

2 answers

548 views

A map of spaces implementing the Pontryagin Thom collapse map? (collapse maps in families)

asked May 22, 2018 at 10:52

8 votes

0 answers

188 views

Mapping class groups of algebraic varieties

asked Nov 24, 2017 at 12:16

7 votes

2 answers

518 views

Do pseudo-differential operators form a sheaf of algebras?

asked Feb 19, 2018 at 21:14

7 votes

2 answers

219 views

Characterizing pseudo-differential operators as a subalgebra of continuous endomorphisms of tempered distributions

asked Jul 3, 2018 at 10:19

7 votes

0 answers

506 views

A general definition of an equisingular family of singular varieties?

asked May 3, 2018 at 12:25

7 votes

0 answers

407 views

Generalities on sheaves - Where can I find the technology that can make this "proof" of Atiyah duality precise?

asked Jun 28, 2017 at 23:32

7 votes

1 answer

1k views

Can the homological dimension of a coherent sheaf explode along a formal deformation? (is the resolution property hereditary for formal deformations?)

asked May 14, 2017 at 21:18

7 votes

1 answer

2k views

Tangent bundle of a homogeneous space and the euler exact sequence

asked Mar 11, 2016 at 13:23

Stack Exchange Network

109 Questions

From Weyl groups to Weyl groupoids?

Understanding the purely formal part of the sheaf theoretic (cohomological) framework for representation theory

The intrinsic meaning of abelian sheaf cohomology of a category

Is there a classification of differential equations over the field of fractions of formal power series? (characteristic 0)

Higher Adeles of a scheme and related topics

What are the analogs of a Levi/Parabolic/Borel/Bruhat over the field with 1 element?

A finite group $G$ all of whose reps are defined over $\mathbb{Z}$ and yet $Rep(G)$ is not generated by permutation representations

Is every endomorphism of the sheaf of holomorphic functions on a disk a differential operator?

About an algebraic construction of a sheaf of formal microdifferential operators

When is a formal deformation convergent?

Categorification of definitions in the context of the derived category of quasi-coherent sheaves

Geometric construcion of Proj as a quotient by a $\mathbb{G}_m$ action

Simplest explicit counterexample for $Vect(BG) \ne Rep(G)$ as monoids

Algebro-geometric version of {vector fields} $\longleftrightarrow$ {flows} correspondence?

Is there any notion of "smoothification" from $\mathbb{R}$-schemes to generalized smooth spaces?

Is the analytification functor part of a geometric morphism of topoi?

Closed formulas for topological K-theory?

Simple characterization of Postnikov & Whitehead towers?

Interactions (functors) between equivariant sheaves for different groups?

Functorial construction of ("pre"-)spectral sequences? (Or - what is the "higher structure" underlying spectral sequences?)

Homotopy theoretic description of homotopy fixed points (and obstructions) for an action of group $G$ on a groupoid $X$

What does the flow of the principal symbol of the differential operator tell us about the PDE?

A map of spaces implementing the Pontryagin Thom collapse map? (collapse maps in families)

Mapping class groups of algebraic varieties

Do pseudo-differential operators form a sheaf of algebras?

Characterizing pseudo-differential operators as a subalgebra of continuous endomorphisms of tempered distributions

A general definition of an equisingular family of singular varieties?

Generalities on sheaves - Where can I find the technology that can make this "proof" of Atiyah duality precise?

Can the homological dimension of a coherent sheaf explode along a formal deformation? (is the resolution property hereditary for formal deformations?)

Tangent bundle of a homogeneous space and the euler exact sequence