Question

Adjunction space is homeomorphic to quotient: an easier proof?

score 337 · Answer 1 · 2026-03-25 09:48:49

337

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Adjunction space is homeomorphic to quotient: an easier proof?

Published on 25 Mar 2026 - 9:48

score 219 · Answer 2 · 2018-08-26 03:26:47

219

Views

Abelian category cokernel

Published on 26 Aug 2018 - 3:26

score 52 · Answer 3 · 2018-08-26 06:16:28

52

Views

Is it true that $C=\operatorname{coker}(f)$?

Published on 26 Aug 2018 - 6:16

score 865 · Answer 4 · 2018-08-26 06:51:39

865

Views

Showing that effaceable delta-functors are universal

Published on 26 Aug 2018 - 6:51

score 104 · Answer 5 · 2026-03-25 09:25:18

104

Views

Fully faithful nerve ⟹ injective on objects?

Published on 25 Mar 2026 - 9:25

score 101 · Answer 6 · 2026-03-27 22:57:48

101

Views

Showing that $\mathbb{P}^1$ is two copies of $\mathbb{C}$ glued together; is there a high-power tool that can help here?

Published on 27 Mar 2026 - 22:57

score 52 · Answer 7 · 2026-03-28 09:33:43

Help with notation/concepts in module theory and category theory, specifically $\operatorname{Add}(M)$, $\operatorname{Gen}(M)$ and $^\circ(M^\circ)$

score 129 · Answer 8 · 2026-03-28 11:03:35

129

Views

Being finitely generated is a Morita invariant

Published on 28 Mar 2026 - 11:03

score 49 · Answer 9 · 2026-03-29 05:10:37

49

Views

Weak factorization systems with right maps non closed under retracts

Published on 29 Mar 2026 - 5:10

score 277 · Answer 10 · 2026-03-28 11:03:57

277

Views

Equivalent definitions of $X$ being a generator for the category $R\text{-}\mathbf{mod}$

Published on 28 Mar 2026 - 11:03

score 187 · Answer 11 · 2026-03-25 03:16:41

187

Views

Computing a functor between two categories

Published on 25 Mar 2026 - 3:16

score 1.2k · Answer 12 · 2026-03-27 01:46:33

1.2k

Views

How should a good course and textbook in category theory be constructed?

Published on 27 Mar 2026 - 1:46

score 262 · Answer 13 · 2018-08-29 10:42:34

Are there functors $F,G:\textbf{Set}^{\operatorname{op}}\to\textbf{Set}$ such that $\operatorname{Hom}(F,G)$ is NOT a set?

score 381 · Answer 14 · 2026-03-22 23:18:21

381

Views

Is : $ \mathrm{Gal} \ : \ F/ \mathbb{Q} \to \mathrm{Gal} (F / \mathbb{Q} ) $ represented by $ \overline{ \mathbb{Q} } $?

Published on 22 Mar 2026 - 23:18

score 69 · Answer 15 · 2018-08-29 22:52:50

In the definition of natural transformations: What do we get, if we choose a morphism for every object in the target category?

List Question

Adjunction space is homeomorphic to quotient: an easier proof?

Abelian category cokernel

Is it true that $C=\operatorname{coker}(f)$?

Showing that effaceable delta-functors are universal

Fully faithful nerve ⟹ injective on objects?

Showing that $\mathbb{P}^1$ is two copies of $\mathbb{C}$ glued together; is there a high-power tool that can help here?

Help with notation/concepts in module theory and category theory, specifically $\operatorname{Add}(M)$, $\operatorname{Gen}(M)$ and $^\circ(M^\circ)$

Being finitely generated is a Morita invariant

Weak factorization systems with right maps non closed under retracts

Equivalent definitions of $X$ being a generator for the category $R\text{-}\mathbf{mod}$

Computing a functor between two categories

How should a good course and textbook in category theory be constructed?

Are there functors $F,G:\textbf{Set}^{\operatorname{op}}\to\textbf{Set}$ such that $\operatorname{Hom}(F,G)$ is NOT a set?

Is : $ \mathrm{Gal} \ : \ F/ \mathbb{Q} \to \mathrm{Gal} (F / \mathbb{Q} ) $ represented by $ \overline{ \mathbb{Q} } $?

In the definition of natural transformations: What do we get, if we choose a morphism for every object in the target category?

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