List questions from category-theory

Published on 25 Mar 2026 - 1:21

194

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Group object in category of topological spaces over a fixed space

Published on 01 Apr 2018 - 12:13

650

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Classifying space of a category / classifying space of a group

Published on 25 Mar 2026 - 4:37

63

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Name for a certain kind of "factor object" in a category

Published on 01 Apr 2018 - 17:56

693

Views

Questions on hypercohomology

Published on 22 Mar 2026 - 0:08

304

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The opposite of the covariant hom functor

Published on 02 Apr 2018 - 12:31

131

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A question on the half-full functor

Published on 02 Apr 2018 - 17:14

231

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Group objects in a slice category

Published on 03 Apr 2018 - 3:38

504

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Example of faithful functor that takes two distinct maps to the same map

Published on 03 Apr 2018 - 9:18

697

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Short exact sequence of functors which splits, but not naturally (revisited, motivated by the Universal Coefficient Theorem)

Published on 03 Apr 2018 - 12:53

189

Views

counterexample to universal quantification being the right adjoint of substitution?

Published on 25 Mar 2026 - 0:01

253

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Are all isomorphisms contained in the class of weak equivalences?

Published on 25 Mar 2026 - 14:45

204

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Given an equivalence relation ${\sim} \in \Pi(U(X))$, is the meet of all the congruences $R \geq {\sim}$ a congruence?

Published on 25 Mar 2026 - 1:29

287

Views

The limit of a coproduct (of functors) is the product of the limits

Published on 25 Mar 2026 - 0:02

130

Views

What is an equationally presentable category?

Published on 04 Apr 2018 - 13:25

List Question

Condition for Being Galois

Group object in category of topological spaces over a fixed space

Classifying space of a category / classifying space of a group

Name for a certain kind of "factor object" in a category

Questions on hypercohomology

The opposite of the covariant hom functor

A question on the half-full functor

Group objects in a slice category

Example of faithful functor that takes two distinct maps to the same map

Short exact sequence of functors which splits, but not naturally (revisited, motivated by the Universal Coefficient Theorem)

counterexample to universal quantification being the right adjoint of substitution?

Are all isomorphisms contained in the class of weak equivalences?

Given an equivalence relation ${\sim} \in \Pi(U(X))$, is the meet of all the congruences $R \geq {\sim}$ a congruence?

The limit of a coproduct (of functors) is the product of the limits

What is an equationally presentable category?

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