List questions from category-theory

Published on 14 Apr 2026 - 4:09

55

Views

Dual of a replete subcategory in a rigid tensor-triangulated category is replete.

Published on 16 Apr 2026 - 0:08

300

Views

The product of topological spaces

Published on 11 Apr 2026 - 0:45

119

Views

Enriched Categories In TQFT

Published on 27 Mar 2026 - 5:58

234

Views

Dualizing the statement "left exact iff preserves kernels"

Published on 17 Apr 2026 - 7:44

31

Views

Paracompact iff deformation retract of classifying space of every open cover?

Published on 14 Apr 2026 - 3:34

130

Views

Categorical construction - do I have a functor?

Published on 26 Mar 2026 - 6:20

674

Views

Why is adjoining a unit the algebraic counterpart to the one point compactification?

Published on 13 Apr 2026 - 18:39

469

Views

Elementary definition of delooping

Published on 10 Apr 2026 - 18:10

2.6k

Views

A morphism of sheaves of sets is an isomorphism if it induces an isomorphism of all stalks.

Published on 15 Apr 2026 - 7:03

113

Views

Geometric realisation of the forgetful and other functors

Published on 14 Apr 2026 - 15:40

501

Views

Hom functor in an abelian category?

Published on 16 Apr 2026 - 21:29

202

Views

Let $A\to B\to C\to 0$ be exact, and $F$ a right-exact functor. Why must $F(A)\to F(B)\to F(C)\to 0$ be exact?

Published on 13 Apr 2026 - 16:12

67

Views

Alternative notations of Function Composition

Published on 10 Apr 2026 - 12:51

110

Views

How do we know that topological spaces and groups are essentially different?

Published on 11 Apr 2026 - 23:00

List Question

Monoidal structures on small categories and how to find them

Dual of a replete subcategory in a rigid tensor-triangulated category is replete.

The product of topological spaces

Enriched Categories In TQFT

Dualizing the statement "left exact iff preserves kernels"

Paracompact iff deformation retract of classifying space of every open cover?

Categorical construction - do I have a functor?

Why is adjoining a unit the algebraic counterpart to the one point compactification?

Elementary definition of delooping

A morphism of sheaves of sets is an isomorphism if it induces an isomorphism of all stalks.

Geometric realisation of the forgetful and other functors

Hom functor in an abelian category?

Let $A\to B\to C\to 0$ be exact, and $F$ a right-exact functor. Why must $F(A)\to F(B)\to F(C)\to 0$ be exact?

Alternative notations of Function Composition

How do we know that topological spaces and groups are essentially different?

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