List questions from category-theory

Published on 01 Mar 2018 - 1:36

143

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Lattice subobjects of the power object in a topos

Published on 22 Mar 2026 - 17:45

218

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Coincidence of classical notion of covering in classical topology and covering sieve in grothendieck topology

Published on 25 Mar 2026 - 14:09

454

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Epimorphisms of the Category of Hausdorff topological spaces

Published on 01 Mar 2018 - 21:30

189

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Colimit of collection of finite sets

Published on 25 Mar 2026 - 7:57

351

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Pushout of a mono which is not a mono.

Published on 02 Mar 2018 - 16:26

496

Views

Is there an endofunctor of the category of sets that maps $\kappa$ to $\kappa^+$?

Published on 02 Mar 2018 - 20:44

382

Views

What is a group object in categories of : Lie algebras, modules

Published on 02 Mar 2018 - 21:45

55

Views

Concluding that $\mathcal{C}/S$ is complete if $\mathcal{C}$ is complete

Published on 24 Mar 2026 - 22:11

1.1k

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How can a monoid be a category with just one object?

Published on 24 Mar 2026 - 22:08

81

Views

Composition of arrows on slice category

Published on 03 Mar 2018 - 12:00

165

Views

A natural transformation between the categories $\pi_1X$ and $\pi_1Y$

Published on 03 Mar 2018 - 12:08

220

Views

Complete semilattices in category theory

Published on 25 Mar 2026 - 7:09

57

Views

Are category isomorphisms also homomorphisms?

Published on 03 Mar 2018 - 18:18

434

Views

How to show that $\mathsf{Ab}$(Category of Abelian Groups) is an abelian category?

Published on 23 Mar 2026 - 12:14

List Question

Is Pic a functor?

Lattice subobjects of the power object in a topos

Coincidence of classical notion of covering in classical topology and covering sieve in grothendieck topology

Epimorphisms of the Category of Hausdorff topological spaces

Colimit of collection of finite sets

Pushout of a mono which is not a mono.

Is there an endofunctor of the category of sets that maps $\kappa$ to $\kappa^+$?

What is a group object in categories of : Lie algebras, modules

Concluding that $\mathcal{C}/S$ is complete if $\mathcal{C}$ is complete

How can a monoid be a category with just one object?

Composition of arrows on slice category

A natural transformation between the categories $\pi_1X$ and $\pi_1Y$

Complete semilattices in category theory

Are category isomorphisms also homomorphisms?

How to show that $\mathsf{Ab}$(Category of Abelian Groups) is an abelian category?

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