User Greg Friedman

9 votes

Integral homology classes that can be represented by immersed submanifolds but not embedded submanifolds

answered Aug 2, 2023 at 7:11

4 votes

Subdivision of geometric simplicial complex

answered Jul 23, 2023 at 9:34

1 vote

Accepted

Does the cohomology Bockstein homomorphism map to the homology Bockstein homomorphism under Poincarè duality?

answered May 23, 2023 at 3:44

3 votes

Accepted

Linking form for homology with general coefficients

answered May 16, 2023 at 5:31

4 votes

Accepted

Cohomology of the coned off space

answered Aug 3, 2022 at 6:50

3 votes

A question on relation of different triangulations of a triangulable space

answered Jul 6, 2022 at 9:45

3 votes

Accepted

Annulus theorem for pseudomanifolds

answered Mar 9, 2022 at 11:25

2 votes

Accepted

Relation between cohomological dimensions of manifolds

answered Dec 2, 2021 at 7:47

6 votes

If $H_i(U_j)=0$ for infinitely many $j$ then $H_i(X)=0$

answered Nov 6, 2021 at 10:42

7 votes

Computing Massey products via intersection theory

answered Jun 25, 2021 at 0:20

3 votes

Upgrading various algebro-geometric cohomology theories to be equivariant

answered Jun 16, 2021 at 7:16

3 votes

Embedded submanifold in a cylinder

answered Jun 11, 2021 at 3:23

5 votes

Books in advanced differential topology

answered Jun 3, 2021 at 8:13

1 vote

Heredity of stratified pseudomanifolds

answered Feb 19, 2021 at 9:49

15 votes

Accepted

Any shortcuts to understanding the properties of the Riemannian manifolds which are used in the books on algebraic topology

answered Jan 6, 2021 at 11:35

6 votes

How to deal with an advisor that offers you nearly no advising at all?

answered Sep 30, 2020 at 1:10

29 votes

Short exact sequences every mathematician should know

answered Jun 22, 2020 at 3:54

4 votes

Homology of topological manifolds

answered May 15, 2020 at 5:42

6 votes

A recommendation for a book on perverse sheaves

answered May 10, 2020 at 7:17

3 votes

Alexander duality and homology equivalence

answered Jan 27, 2020 at 8:47

16 votes

So what exactly are perverse sheaves anyway?

answered Dec 30, 2019 at 5:36

2 votes

How to compute the cohomology of a local system?

answered Dec 4, 2019 at 8:00

4 votes

Background needed to understand modern research on knot homology theories

answered Jun 20, 2019 at 21:45

2 votes

Accepted

Difference between local cohomology and cohomology with support in a family

answered May 1, 2019 at 17:21

1 vote

Accepted

What is the hypercohomology of the push-forward of the intersection chain complex of an open cone to its closure?

answered Nov 1, 2018 at 6:39

5 votes

Accepted

Confusion about a proof from Goresky and MacPherson's "Intersection Homology II"

answered Apr 19, 2018 at 1:15

2 votes

Internal product on intersection (co)homology

answered Mar 22, 2018 at 2:16

2 votes

Accepted

Relative de rham cohomology with compact support

answered Feb 11, 2018 at 9:55

1 vote

Accepted

Confusion about locally cone-like spaces

answered Nov 24, 2017 at 2:46

5 votes

Is singular barycentric subdivision injective?

answered Mar 27, 2017 at 7:46

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64 Answers

Integral homology classes that can be represented by immersed submanifolds but not embedded submanifolds

Subdivision of geometric simplicial complex

Does the cohomology Bockstein homomorphism map to the homology Bockstein homomorphism under Poincarè duality?

Linking form for homology with general coefficients

Cohomology of the coned off space

A question on relation of different triangulations of a triangulable space

Annulus theorem for pseudomanifolds

Relation between cohomological dimensions of manifolds

If $H_i(U_j)=0$ for infinitely many $j$ then $H_i(X)=0$

Computing Massey products via intersection theory

Upgrading various algebro-geometric cohomology theories to be equivariant

Embedded submanifold in a cylinder

Books in advanced differential topology

Heredity of stratified pseudomanifolds

Any shortcuts to understanding the properties of the Riemannian manifolds which are used in the books on algebraic topology

How to deal with an advisor that offers you nearly no advising at all?

Short exact sequences every mathematician should know

Homology of topological manifolds

A recommendation for a book on perverse sheaves

Alexander duality and homology equivalence

So what exactly are perverse sheaves anyway?

How to compute the cohomology of a local system?

Background needed to understand modern research on knot homology theories

Difference between local cohomology and cohomology with support in a family

What is the hypercohomology of the push-forward of the intersection chain complex of an open cone to its closure?

Confusion about a proof from Goresky and MacPherson's "Intersection Homology II"

Internal product on intersection (co)homology

Relative de rham cohomology with compact support

Confusion about locally cone-like spaces

Is singular barycentric subdivision injective?