User Chris Schommer-Pries

143 votes

Accepted

What is torsion in differential geometry intuitively?

answered Apr 6, 2010 at 14:25

96 votes

Your favorite surprising connections in mathematics

answered Feb 8, 2010 at 15:24

73 votes

Do we still need model categories?

answered Oct 18, 2011 at 1:31

68 votes

Accepted

Is there an accepted definition of $(\infty,\infty)$ category?

answered Jun 18, 2013 at 23:42

49 votes

What are surprising examples of Model Categories?

answered Mar 12, 2012 at 19:07

45 votes

Difference between represented and singular cohomology?

answered Jun 25, 2010 at 4:01

40 votes

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Classifiying sphere eversions

answered Sep 8, 2015 at 10:07

35 votes

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Maps inducing zero on homotopy groups but are not null-homotopic

answered Apr 4, 2010 at 3:07

30 votes

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"Homotopy-first" courses in algebraic topology

answered Mar 21, 2010 at 21:16

29 votes

Are dagger categories truly evil?

answered Oct 5, 2015 at 14:03

28 votes

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Nilpotence of the stable Hopf map via framed cobordism

answered Sep 11, 2015 at 15:47

26 votes

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Is every category a localization of a poset?

answered Sep 3, 2021 at 15:52

21 votes

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Is super-vector spaces a "universal central extension" of vector spaces?

answered Dec 8, 2011 at 22:10

20 votes

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Every Manifold Cobordant to a Simply Connected Manifold

answered Feb 10, 2010 at 15:10

20 votes

Accepted

For what topological groups $G$ can we take $EG \rightarrow BG$ to be of the form $S^{\infty} \rightarrow BG$?

answered Feb 9, 2021 at 15:39

19 votes

What is the motivation for maps of adjunctions?

answered Mar 1, 2010 at 13:58

19 votes

Twistings for other cohomology theories

answered Jun 9, 2010 at 15:24

18 votes

Is the category of commutative group schemes abelian?

answered Sep 10, 2010 at 1:18

18 votes

Concrete example of $\infty$-categories

answered Aug 26, 2011 at 19:08

18 votes

Accepted

What is the classifying space of "G-bundles with connections"

answered Feb 17, 2010 at 21:32

18 votes

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What is the free symmetric monoidal $\infty$-category on one object?

answered Jul 26, 2021 at 18:03

18 votes

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A search for a sequence of $6$-manifolds

answered Aug 30, 2017 at 19:38

18 votes

Does $M^o=N^o$ imply that $\partial M = \partial N$?

answered Sep 14, 2018 at 16:04

17 votes

Accepted

How aggressive is the fibrant replacement of $\mathrm{Bord}_n$?

answered Dec 3, 2020 at 19:53

17 votes

Is an algebraic space group always a scheme?

answered Dec 16, 2009 at 3:10

16 votes

Accepted

Derived categories and homotopy categories

answered Oct 12, 2009 at 19:46

16 votes

Why do gerbes live in H^2?

answered Mar 25, 2010 at 11:54

16 votes

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Is there a symmetric monoidal 2-category "SuperDuperVect"?

answered Nov 17, 2015 at 14:20

16 votes

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Super-cobordisms

answered Feb 19, 2015 at 11:51

15 votes

What's the right way to think about "anomalies" in 3d TQFTs?

answered Oct 12, 2009 at 22:22

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127 Answers

What is torsion in differential geometry intuitively?

Your favorite surprising connections in mathematics

Do we still need model categories?

Is there an accepted definition of $(\infty,\infty)$ category?

What are surprising examples of Model Categories?

Difference between represented and singular cohomology?

Classifiying sphere eversions

Maps inducing zero on homotopy groups but are not null-homotopic

"Homotopy-first" courses in algebraic topology

Are dagger categories truly evil?

Nilpotence of the stable Hopf map via framed cobordism

Is every category a localization of a poset?

Is super-vector spaces a "universal central extension" of vector spaces?

Every Manifold Cobordant to a Simply Connected Manifold

For what topological groups $G$ can we take $EG \rightarrow BG$ to be of the form $S^{\infty} \rightarrow BG$?

What is the motivation for maps of adjunctions?

Twistings for other cohomology theories

Is the category of commutative group schemes abelian?

Concrete example of $\infty$-categories

What is the classifying space of "G-bundles with connections"

What is the free symmetric monoidal $\infty$-category on one object?

A search for a sequence of $6$-manifolds

Does $M^o=N^o$ imply that $\partial M = \partial N$?

How aggressive is the fibrant replacement of $\mathrm{Bord}_n$?

Is an algebraic space group always a scheme?

Derived categories and homotopy categories

Why do gerbes live in H^2?

Is there a symmetric monoidal 2-category "SuperDuperVect"?

Super-cobordisms

What's the right way to think about "anomalies" in 3d TQFTs?