Question

Commutative diagram between modules and their double dual

score 74 · Answer 1 · 2026-05-10 20:06:26

74

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Commutative diagram between modules and their double dual

Published on 10 May 2026 - 20:06

score 93 · Answer 2 · 2026-04-26 14:35:49

93

Views

Need help drawing these diagrams in category theory (sources for good diagrams would also be appreciated)

Published on 26 Apr 2026 - 14:35

score 85 · Answer 3 · 2026-03-25 10:58:57

85

Views

Extension of a homomorphism from $(H \leq G) \xrightarrow{\varphi} X$ to $G \xrightarrow{\psi}X$ -- Is this a correct diagram?

Published on 25 Mar 2026 - 10:58

score 104 · Answer 4 · 2026-03-25 10:56:03

104

Views

Not understanding concretely the Wikipedia or text definition of "Subobject classifier"

Published on 25 Mar 2026 - 10:56

score 51 · Answer 5 · 2026-03-25 10:57:05

51

Views

What are colored morphisms/arrows intended to mean in these diagrams?

Published on 25 Mar 2026 - 10:57

score 180 · Answer 6 · 2026-03-25 10:57:28

180

Views

What is the most diagrammatic proof that $gf = 0 \implies \text{im } f \subset \ker g$?

Published on 25 Mar 2026 - 10:57

score 71 · Answer 7 · 2026-03-25 10:55:39

71

Views

Commutative diagrams of exact rows.

Published on 25 Mar 2026 - 10:55

score 51 · Answer 8 · 2026-03-25 10:53:43

51

Views

Follow up question on diagram-chasing/short exact sequences.

Published on 25 Mar 2026 - 10:53

score 46 · Answer 9 · 2026-03-25 10:55:51

46

Views

Proving that the functor $\mathscr{B} \rightarrow 1$ is limit-preserving. Need help constructing the diagram.

Published on 25 Mar 2026 - 10:55

score 63 · Answer 10 · 2026-03-25 10:59:00

How does the following commutative diagram within the following proof match the definition for universal property of the kernel and also what is $g?$

score 148 · Answer 11 · 2026-03-25 10:54:22

148

Views

A question on diagram of groups

Published on 25 Mar 2026 - 10:54

score 76 · Answer 12 · 2026-03-25 10:55:24

76

Views

A question on commutative diagram of abelian groups

Published on 25 Mar 2026 - 10:55

score 99 · Answer 13 · 2026-03-25 10:56:56

99

Views

Comparing order of $\ker f$ and $\ker\tilde{f}$

Published on 25 Mar 2026 - 10:56

score 1.4k · Answer 14 · 2026-03-25 10:56:55

1.4k

Views

Fake diagram lemmas that look like they should work but don't.

Published on 25 Mar 2026 - 10:56

score 46 · Answer 15 · 2026-04-30 11:08:56

46

Views

Doubt in the Magic Square

Published on 30 Apr 2026 - 11:08

List Question

Commutative diagram between modules and their double dual

Need help drawing these diagrams in category theory (sources for good diagrams would also be appreciated)

Extension of a homomorphism from $(H \leq G) \xrightarrow{\varphi} X$ to $G \xrightarrow{\psi}X$ -- Is this a correct diagram?

Not understanding concretely the Wikipedia or text definition of "Subobject classifier"

What are colored morphisms/arrows intended to mean in these diagrams?

What is the most diagrammatic proof that $gf = 0 \implies \text{im } f \subset \ker g$?

Commutative diagrams of exact rows.

Follow up question on diagram-chasing/short exact sequences.

Proving that the functor $\mathscr{B} \rightarrow 1$ is limit-preserving. Need help constructing the diagram.

How does the following commutative diagram within the following proof match the definition for universal property of the kernel and also what is $g?$

A question on diagram of groups

A question on commutative diagram of abelian groups

Comparing order of $\ker f$ and $\ker\tilde{f}$

Fake diagram lemmas that look like they should work but don't.

Doubt in the Magic Square

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