Question

Is there a universal mapping property satisfied by the disjoint union of totally ordered sets?

score 535 · Answer 1 · 2026-04-14 05:31:52

535

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Is there a universal mapping property satisfied by the disjoint union of totally ordered sets?

Published on 14 Apr 2026 - 5:31

score 3.5k · Answer 2 · 2026-04-09 10:08:22

3.5k

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Universal object

Published on 09 Apr 2026 - 10:08

score 9.4k · Answer 3 · 2026-04-12 10:46:25

9.4k

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Book for Algebraic Topology- Spanier vs Tom Dieck

Published on 12 Apr 2026 - 10:46

score 1k · Answer 4 · 2026-04-12 23:48:21

1k

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Categorical description of equivalence relation generated by a relation?

Published on 12 Apr 2026 - 23:48

score 231 · Answer 5 · 2026-03-28 08:36:35

231

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sheaves of rings and maps to classifying topos

Published on 28 Mar 2026 - 8:36

score 577 · Answer 6 · 2026-03-27 14:03:22

577

Views

Direct way to show that 2-out-of-6 holds for weak equivalences in a model category?

Published on 27 Mar 2026 - 14:03

score 175 · Answer 7 · 2026-04-11 15:02:04

175

Views

Categorical description of Alexander horned sphere?

Published on 11 Apr 2026 - 15:02

score 461 · Answer 8 · 2026-04-14 02:20:50

461

Views

Explicitly describe colimits in $\mathsf{Set}$

Published on 14 Apr 2026 - 2:20

score 589 · Answer 9 · 2026-04-13 11:45:40

589

Views

Boolean algebra gives rise to a ring

Published on 13 Apr 2026 - 11:45

score 333 · Answer 10 · 2026-04-13 19:11:30

333

Views

Intuition for the Discrete$\dashv$Forgetful$\dashv$Indiscrete Adjunction in $\mathsf{Top}$

Published on 13 Apr 2026 - 19:11

score 133 · Answer 11 · 2026-04-13 05:44:27

133

Views

nicer proof of basic functor category fact?

Published on 13 Apr 2026 - 5:44

score 159 · Answer 12 · 2026-04-14 06:35:10

159

Views

inverse system vs inverse sequence

Published on 14 Apr 2026 - 6:35

score 1.1k · Answer 13 · 2026-04-11 12:34:27

1.1k

Views

What's the explicit categorical relation between a linear transformation and its matrix representation?

Published on 11 Apr 2026 - 12:34

score 318 · Answer 14 · 2026-04-12 16:09:13

318

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Compact objects and locally finitely presentable categories (the Category of Groups)

Published on 12 Apr 2026 - 16:09

score 134 · Answer 15 · 2026-03-28 10:04:37

134

Views

Example of a $1$-categorical statement that really doesn't hold $\infty$-categorically

Published on 28 Mar 2026 - 10:04

List Question

Is there a universal mapping property satisfied by the disjoint union of totally ordered sets?

Universal object

Book for Algebraic Topology- Spanier vs Tom Dieck

Categorical description of equivalence relation generated by a relation?

sheaves of rings and maps to classifying topos

Direct way to show that 2-out-of-6 holds for weak equivalences in a model category?

Categorical description of Alexander horned sphere?

Explicitly describe colimits in $\mathsf{Set}$

Boolean algebra gives rise to a ring

Intuition for the Discrete$\dashv$Forgetful$\dashv$Indiscrete Adjunction in $\mathsf{Top}$

nicer proof of basic functor category fact?

inverse system vs inverse sequence

What's the explicit categorical relation between a linear transformation and its matrix representation?

Compact objects and locally finitely presentable categories (the Category of Groups)

Example of a $1$-categorical statement that really doesn't hold $\infty$-categorically

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