Question

what is the difference between essential geometric morphisms and open geometric morphisms?

score 96 · Answer 1 · 2026-04-08 16:47:14

96

Views

what is the difference between essential geometric morphisms and open geometric morphisms?

Published on 08 Apr 2026 - 16:47

score 156 · Answer 2 · 2026-04-16 18:32:35

156

Views

Is the functor category of a small category into a topos itself a topos?

Published on 16 Apr 2026 - 18:32

score 65 · Answer 3 · 2026-05-10 19:51:07

65

Views

Are all module categories over the category $\mathrm{Rep}_k(G)$ given by $\mathrm{Rep}_k(H)$ for a subgroup $H\subset G$?

Published on 10 May 2026 - 19:51

score 151 · Answer 4 · 2026-05-11 09:29:59

151

Views

Dualising the Yoneda lemma.

Published on 11 May 2026 - 9:29

score 86 · Answer 5 · 2026-05-15 07:41:15

86

Views

Why is the one object category corresponding to a monoid not equivalent (as categories) to it's opposite category?

Published on 15 May 2026 - 7:41

score 86 · Answer 6 · 2026-05-11 08:01:47

86

Views

Nullhomotopy implies existence of an arrow for homotopy fibration

Published on 11 May 2026 - 8:01

score 89 · Answer 7 · 2026-05-11 06:15:38

89

Views

Presheaf is terminal iff it maps every object to a singleton

Published on 11 May 2026 - 6:15

score 70 · Answer 8 · 2026-04-15 20:13:22

70

Views

Adjoint maps in the 2-category of topological spaces

Published on 15 Apr 2026 - 20:13

score 66 · Answer 9 · 2026-04-16 20:07:29

66

Views

General category with finite products as a cartesian monoidal category

Published on 16 Apr 2026 - 20:07

score 36 · Answer 10 · 2026-04-15 03:51:03

36

Views

Example of non-uniqueness of weak pullbacks

Published on 15 Apr 2026 - 3:51

score 200 · Answer 11 · 2026-04-16 13:51:46

200

Views

Exact sequence and short exact sequence

Published on 16 Apr 2026 - 13:51

score 102 · Answer 12 · 2026-05-10 16:26:37

102

Views

Canonical Isomorphisms

Published on 10 May 2026 - 16:26

score 155 · Answer 13 · 2026-04-15 13:05:16

155

Views

How easy is it to prove that it's safe to adjoin product objects to a category?

Published on 15 Apr 2026 - 13:05

score 46 · Answer 14 · 2026-04-09 08:16:13

46

Views

What does exactly mean "the spectral algebra $W_{A}$"?

Published on 09 Apr 2026 - 8:16

score 59 · Answer 15 · 2026-04-12 06:19:35

59

Views

Confused about maps of pairs

Published on 12 Apr 2026 - 6:19

List Question

what is the difference between essential geometric morphisms and open geometric morphisms?

Is the functor category of a small category into a topos itself a topos?

Are all module categories over the category $\mathrm{Rep}_k(G)$ given by $\mathrm{Rep}_k(H)$ for a subgroup $H\subset G$?

Dualising the Yoneda lemma.

Why is the one object category corresponding to a monoid not equivalent (as categories) to it's opposite category?

Nullhomotopy implies existence of an arrow for homotopy fibration

Presheaf is terminal iff it maps every object to a singleton

Adjoint maps in the 2-category of topological spaces

General category with finite products as a cartesian monoidal category

Example of non-uniqueness of weak pullbacks

Exact sequence and short exact sequence

Canonical Isomorphisms

How easy is it to prove that it's safe to adjoin product objects to a category?

What does exactly mean "the spectral algebra $W_{A}$"?

Confused about maps of pairs

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