Question

How to use Ken Brown's lemma in page 11 of "Model Categories"?

score 437 · Answer 1 · 2026-04-17 02:16:08

437

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How to use Ken Brown's lemma in page 11 of "Model Categories"?

Published on 17 Apr 2026 - 2:16

score 358 · Answer 2 · 2026-04-17 12:54:32

358

Views

Injective implies divisible: generalizing proof from finitely generated to arbitrary abelian group

Published on 17 Apr 2026 - 12:54

score 662 · Answer 3 · 2026-04-09 00:22:04

662

Views

Showing a functor has no right adjoint

Published on 09 Apr 2026 - 0:22

score 253 · Answer 4 · 2026-04-08 11:04:23

253

Views

Finding adjoints to a functor

Published on 08 Apr 2026 - 11:04

score 122 · Answer 5 · 2026-04-11 13:44:58

122

Views

The Yoneda Lemma and "Completely Characterize"

Published on 11 Apr 2026 - 13:44

score 811 · Answer 6 · 2026-04-16 05:06:07

811

Views

Do adjoint functors "preserve" commutative diagrams?

Published on 16 Apr 2026 - 5:06

score 38 · Answer 7 · 2026-04-09 05:32:19

38

Views

Equivalence of definitions of symmetric relations

Published on 09 Apr 2026 - 5:32

score 159 · Answer 8 · 2026-05-06 00:24:24

159

Views

Existence of Spec functor

Published on 06 May 2026 - 0:24

score 171 · Answer 9 · 2026-04-16 16:54:31

171

Views

Is every category whose subobject functor is a hyperdoctrine a Heyting category?

Published on 16 Apr 2026 - 16:54

score 91 · Answer 10 · 2026-04-21 21:32:40

91

Views

Confusion about direction of arrow in general extension of scalars (base change)

Published on 21 Apr 2026 - 21:32

score 339 · Answer 11 · 2026-05-04 21:07:49

339

Views

The schema of category theory used without mentioning "category theory"?

Published on 04 May 2026 - 21:07

score 347 · Answer 12 · 2026-04-15 03:57:41

347

Views

Show that partitions and equivalence relations are interdefineable.

Published on 15 Apr 2026 - 3:57

score 693 · Answer 13 · 2026-04-15 16:05:24

693

Views

is the centre of a category the set of identity morphisms?

Published on 15 Apr 2026 - 16:05

score 306 · Answer 14 · 2026-04-16 01:05:57

306

Views

Powerset functor on category Rel (sets and relations)

Published on 16 Apr 2026 - 1:05

score 135 · Answer 15 · 2026-04-15 09:51:42

135

Views

A concrete category has only forgetful functors?

Published on 15 Apr 2026 - 9:51

List Question

How to use Ken Brown's lemma in page 11 of "Model Categories"?

Injective implies divisible: generalizing proof from finitely generated to arbitrary abelian group

Showing a functor has no right adjoint

Finding adjoints to a functor

The Yoneda Lemma and "Completely Characterize"

Do adjoint functors "preserve" commutative diagrams?

Equivalence of definitions of symmetric relations

Existence of Spec functor

Is every category whose subobject functor is a hyperdoctrine a Heyting category?

Confusion about direction of arrow in general extension of scalars (base change)

The schema of category theory used without mentioning "category theory"?

Show that partitions and equivalence relations are interdefineable.

is the centre of a category the set of identity morphisms?

Powerset functor on category Rel (sets and relations)

A concrete category has only forgetful functors?

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