User Reid Barton

49 votes

1 answer

8k views

Order of an automorphism of a finite group

asked Oct 18, 2009 at 21:17

28 votes

4 answers

4k views

(∞, 1)-categorical description of equivariant homotopy theory

asked Oct 28, 2009 at 22:28

23 votes

2 answers

1k views

Semiadditivity and dualizability of 2

asked Feb 6, 2010 at 17:25

20 votes

5 answers

3k views

Does the cohomology ring of a simply-connected space X determine the cohomology groups of ΩX?

asked Oct 22, 2009 at 21:28

16 votes

2 answers

2k views

What's an example of an "adjunction up to adjunction"?

asked Oct 28, 2009 at 18:58

16 votes

3 answers

3k views

Model category structure on Set without axiom of choice

asked Dec 31, 2009 at 7:07

15 votes

1 answer

1k views

Stable ∞-categories as spectral categories

asked Jan 1, 2010 at 21:00

15 votes

2 answers

755 views

$\mu$-presentable object as $\mu$-small colimit of $\lambda$-presentable objects

asked Mar 12, 2019 at 17:09

15 votes

3 answers

1k views

Extending Kan fibrations, without using minimal fibrations

asked May 9, 2019 at 14:46

15 votes

2 answers

3k views

How should we define "locally small"?

asked Oct 30, 2009 at 5:59

12 votes

2 answers

902 views

When do the Reedy and injective model category structures agree?

asked Mar 30, 2010 at 2:25

12 votes

2 answers

1k views

$Ax^2 + By^3$ representing infinitely many primes

asked Feb 4, 2019 at 22:00

11 votes

1 answer

946 views

Is ΩΣ in {simplicial commutative monoids} group completion?

asked Jan 30, 2010 at 22:43

11 votes

1 answer

336 views

cardinality of final coalgebras in Top

asked Oct 19, 2009 at 19:25

11 votes

2 answers

2k views

algebraic K-theory and tensor products

asked Oct 18, 2009 at 2:22

10 votes

1 answer

943 views

Cyclic spaces and S^1-equivariant homotopy theory

asked Dec 1, 2009 at 3:51

9 votes

2 answers

585 views

Are bicategories of lax functors also bicategories of of pseudofunctors?

asked Dec 4, 2009 at 7:17

9 votes

1 answer

723 views

Presentation for the double cover of A_n

asked Dec 20, 2009 at 5:50

9 votes

1 answer

626 views

Stable presentable categories as module categories

asked Nov 8, 2009 at 22:32

9 votes

2 answers

287 views

Rank of presentability of internal Hom of locally presentable categories

asked Mar 5, 2019 at 14:40

9 votes

2 answers

1k views

Terminology: lax vs. oplax colimits

asked Mar 2, 2010 at 22:12

8 votes

0 answers

304 views

Can Postnikov towers converge without Postnikov completeness?

asked Apr 1 at 17:34

8 votes

1 answer

575 views

Homotopy orbit spaces of representation spheres

asked Nov 11, 2009 at 7:07

7 votes

2 answers

640 views

Naive Z/2-spectrum structure on E smash E?

asked Dec 2, 2009 at 5:47

7 votes

1 answer

572 views

Categorical duals in Banach spaces

asked Jan 5, 2010 at 6:07

7 votes

1 answer

211 views

Simplicial localization of the cofibrant-fibrant objects

asked Feb 20, 2019 at 22:47

6 votes

1 answer

471 views

Example of non-saturated (co)fibration category

asked Feb 7, 2021 at 13:11

6 votes

3 answers

1k views

Quotient of a category by a free group action

asked Oct 15, 2009 at 19:19

6 votes

1 answer

639 views

Do homotopy pullbacks commute with homotopy orbits (in spaces)?

asked Oct 17, 2009 at 4:50

5 votes

2 answers

944 views

What is $TC(\Sigma^\infty \Omega X)$?

asked Dec 1, 2009 at 4:11

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30 Questions

Order of an automorphism of a finite group

(∞, 1)-categorical description of equivariant homotopy theory

Semiadditivity and dualizability of 2

Does the cohomology ring of a simply-connected space X determine the cohomology groups of ΩX?

What's an example of an "adjunction up to adjunction"?

Model category structure on Set without axiom of choice

Stable ∞-categories as spectral categories

$\mu$-presentable object as $\mu$-small colimit of $\lambda$-presentable objects

Extending Kan fibrations, without using minimal fibrations

How should we define "locally small"?

When do the Reedy and injective model category structures agree?

$Ax^2 + By^3$ representing infinitely many primes

Is ΩΣ in {simplicial commutative monoids} group completion?

cardinality of final coalgebras in Top

algebraic K-theory and tensor products

Cyclic spaces and S^1-equivariant homotopy theory

Are bicategories of lax functors also bicategories of of pseudofunctors?

Presentation for the double cover of A_n

Stable presentable categories as module categories

Rank of presentability of internal Hom of locally presentable categories

Terminology: lax vs. oplax colimits

Can Postnikov towers converge without Postnikov completeness?

Homotopy orbit spaces of representation spheres

Naive Z/2-spectrum structure on E smash E?

Categorical duals in Banach spaces

Simplicial localization of the cofibrant-fibrant objects

Example of non-saturated (co)fibration category

Quotient of a category by a free group action

Do homotopy pullbacks commute with homotopy orbits (in spaces)?

What is $TC(\Sigma^\infty \Omega X)$?