Question

Is a pre-additive structure on a category $\mathcal{C}$ necesarrily unique?

score 265 · Answer 1 · 2026-04-06 17:03:21

265

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Is a pre-additive structure on a category $\mathcal{C}$ necesarrily unique?

Published on 06 Apr 2026 - 17:03

score 2.7k · Answer 2 · 2026-03-29 15:31:10

2.7k

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Recommendation on Category theory textbook

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score 253 · Answer 3 · 2026-04-11 07:07:59

253

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What is the restricted product categorically?

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score 201 · Answer 4 · 2014-09-03 13:12:43

201

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Idempotents and Adjoints

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score 192 · Answer 5 · 2026-04-11 15:18:37

192

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Do schemes have a characterisation as an etale space?

Published on 11 Apr 2026 - 15:18

score 184 · Answer 6 · 2026-03-25 11:01:28

184

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Do any 2 morphisms from objects $X$ to $Y$ define a chain homotopy equivalence?

Published on 25 Mar 2026 - 11:01

score 380 · Answer 7 · 2026-04-12 07:03:44

380

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Is there a name for taking the pushforward (ie pushout) over the pullback?

Published on 12 Apr 2026 - 7:03

score 1.9k · Answer 8 · 2014-09-05 04:21:39

1.9k

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Proving that the forgetful functor $U:\mathbf{Ring}\to\mathbf{Set}$ is representable.

Published on 05 Sep 2014 - 4:21

score 368 · Answer 9 · 2026-04-11 05:38:21

368

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Can the integral group ring construction be extended to groupoids in such a way that it provides a functor from Groupoids to Rings?

Published on 11 Apr 2026 - 5:38

score 409 · Answer 10 · 2026-03-26 01:04:39

409

Views

If models of set theory can be construed as categories, can notions of forcing be construed as functors?

Published on 26 Mar 2026 - 1:04

score 705 · Answer 11 · 2026-04-03 04:25:16

705

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Non-bijective isomorphism in a category of of sets.

Published on 03 Apr 2026 - 4:25

score 464 · Answer 12 · 2026-04-03 04:22:36

464

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Commuting with kernels implies left exactness in Abelian category

Published on 03 Apr 2026 - 4:22

score 222 · Answer 13 · 2026-04-11 16:34:13

222

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hom-set definition of limit?

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score 274 · Answer 14 · 2026-04-10 21:57:26

274

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Published on 10 Apr 2026 - 21:57

score 192 · Answer 15 · 2014-09-07 00:42:22

192

Views

Why is every simple object in the category of abelian groups simple in the category of groups?

Published on 07 Sep 2014 - 0:42

List Question

Is a pre-additive structure on a category $\mathcal{C}$ necesarrily unique?

Recommendation on Category theory textbook

What is the restricted product categorically?

Idempotents and Adjoints

Do schemes have a characterisation as an etale space?

Do any 2 morphisms from objects $X$ to $Y$ define a chain homotopy equivalence?

Is there a name for taking the pushforward (ie pushout) over the pullback?

Proving that the forgetful functor $U:\mathbf{Ring}\to\mathbf{Set}$ is representable.

Can the integral group ring construction be extended to groupoids in such a way that it provides a functor from Groupoids to Rings?

If models of set theory can be construed as categories, can notions of forcing be construed as functors?

Non-bijective isomorphism in a category of of sets.

Commuting with kernels implies left exactness in Abelian category

hom-set definition of limit?

Maps from cogroups to groups & Eckmann-Hilton

Why is every simple object in the category of abelian groups simple in the category of groups?

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