List questions from category-theory

Published on 15 Apr 2026 - 5:53

90

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Representable presheaves on the slice category

Published on 04 May 2026 - 8:52

109

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Introduction to topology in modern (categorical) language?

Published on 11 Apr 2026 - 15:28

46

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What does $D(D(f))=D(f)=C(D(f))$ it mean in the category of generalized monoid.

Published on 15 Apr 2026 - 18:13

42

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Amnestic Functors in Concrete Categories

Published on 15 Apr 2026 - 11:08

59

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In preadditive categories, initial objects are terminal

Published on 15 Apr 2026 - 8:25

63

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Sheaf Hom, what is the codomain of this "sheaf" on $X$

Published on 15 Apr 2026 - 21:33

56

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Show that $C^\colon G\to C^(G)$ is a functor from $Gr$ to Cstar

Published on 15 May 2026 - 19:50

71

Views

Pullback of the identity is 'basically' the identity?

Published on 11 Apr 2026 - 17:01

213

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Seifert-van-Kampen theorem for groupoid and group

Published on 14 Apr 2026 - 14:00

71

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Hilbert spaces and directed colimit

Published on 18 Apr 2026 - 2:05

114

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Show that $C^(\mathbb Z)$ is the universal $C^$-algebra generated by a unitary.

Published on 26 Mar 2026 - 11:00

44

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Is the trivial category cocomplete?

Published on 15 Apr 2026 - 5:26

124

Views

Quillen pair with derived equivalence $\implies$ Quillen equivalence

Published on 17 Apr 2026 - 10:24

124

Views

In a category $C$, is Hom$(X, Y)$ the same as (or in bijection with) Hom$(Y, X)$?

Published on 16 Apr 2026 - 16:50

List Question

A pair of adjoint functors and unicity

Representable presheaves on the slice category

Introduction to topology in modern (categorical) language?

What does $D(D(f))=D(f)=C(D(f))$ it mean in the category of generalized monoid.

Amnestic Functors in Concrete Categories

In preadditive categories, initial objects are terminal

Sheaf Hom, what is the codomain of this "sheaf" on $X$

Show that $C^\colon G\to C^(G)$ is a functor from $Gr$ to Cstar

Pullback of the identity is 'basically' the identity?

Seifert-van-Kampen theorem for groupoid and group

Hilbert spaces and directed colimit

Show that $C^(\mathbb Z)$ is the universal $C^$-algebra generated by a unitary.

Is the trivial category cocomplete?

Quillen pair with derived equivalence $\implies$ Quillen equivalence

In a category $C$, is Hom$(X, Y)$ the same as (or in bijection with) Hom$(Y, X)$?

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