Question

Problem 1.25 of Strom's "Modern Classical Homotopy theoy" book

score 31 · Answer 1 · 2026-04-11 02:26:01

31

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Problem 1.25 of Strom's "Modern Classical Homotopy theoy" book

Published on 11 Apr 2026 - 2:26

score 355 · Answer 2 · 2026-04-15 16:09:49

355

Views

Example for a functor which preserves direct sums but doesn't preserve split exact sequnces.

Published on 15 Apr 2026 - 16:09

score 67 · Answer 3 · 2026-03-25 09:26:24

67

Views

Interesting Lawvere-Tierney topologies on Set

Published on 25 Mar 2026 - 9:26

score 43 · Answer 4 · 2026-03-26 01:29:11

43

Views

Construction of a corner of a diagram out of the homotopy pushout

Published on 26 Mar 2026 - 1:29

score 37 · Answer 5 · 2026-04-10 04:51:26

37

Views

Problem 1.28 of Strom's "Modern Classical Homotopy theory" book

Published on 10 Apr 2026 - 4:51

score 1.4k · Answer 6 · 2026-03-26 07:38:23

1.4k

Views

Examples of co-implication (a.k.a co-exponential)

Published on 26 Mar 2026 - 7:38

score 163 · Answer 7 · 2026-03-28 20:53:50

163

Views

Monoidal categories as categories internal to $\textbf{Cat}$

Published on 28 Mar 2026 - 20:53

score 30 · Answer 8 · 2026-03-26 01:34:23

30

Views

a small technical detail

Published on 26 Mar 2026 - 1:34

score 85 · Answer 9 · 2026-04-15 05:52:52

85

Views

A map is a bundle and the isomorphism class depends on a homotopy class

Published on 15 Apr 2026 - 5:52

score 66 · Answer 10 · 2026-03-25 06:04:08

66

Views

Proving exactness not at the connecting hom in a Snake Lemma subproblem.

Published on 25 Mar 2026 - 6:04

score 74 · Answer 11 · 2026-03-25 23:58:47

74

Views

Is there a functor $F$ of left modules preserving $\oplus$ by arbitrary isomorphism, but its restriction to fin. gen. proj. modules isn't additive?

Published on 25 Mar 2026 - 23:58

score 236 · Answer 12 · 2026-04-13 11:55:17

236

Views

What can category theory encode that set theory could not encode, if anything? (Fwd from Quora)

Published on 13 Apr 2026 - 11:55

score 37 · Answer 13 · 2026-04-16 15:11:51

37

Views

is it a stronger property of equalizers?

Published on 16 Apr 2026 - 15:11

score 597 · Answer 14 · 2026-04-16 22:29:54

597

Views

Are epimorphisms in the category of Stone spaces surjective?

Published on 16 Apr 2026 - 22:29

score 57 · Answer 15 · 2026-04-16 18:42:03

57

Views

Category of sheaves generated by a subcategory?

Published on 16 Apr 2026 - 18:42

List Question

Problem 1.25 of Strom's "Modern Classical Homotopy theoy" book

Example for a functor which preserves direct sums but doesn't preserve split exact sequnces.

Interesting Lawvere-Tierney topologies on Set

Construction of a corner of a diagram out of the homotopy pushout

Problem 1.28 of Strom's "Modern Classical Homotopy theory" book

Examples of co-implication (a.k.a co-exponential)

Monoidal categories as categories internal to $\textbf{Cat}$

a small technical detail

A map is a bundle and the isomorphism class depends on a homotopy class

Proving exactness not at the connecting hom in a Snake Lemma subproblem.

Is there a functor $F$ of left modules preserving $\oplus$ by arbitrary isomorphism, but its restriction to fin. gen. proj. modules isn't additive?

What can category theory encode that set theory could not encode, if anything? (Fwd from Quora)

is it a stronger property of equalizers?

Are epimorphisms in the category of Stone spaces surjective?

Category of sheaves generated by a subcategory?

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