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15
Math.TechQA.Club
2026-05-10 09:46:25
100
Views
In an additive category, why a morphism between complexes can be factored as a composition of a homotopy equivalence and a monomorphism?
Published on
10 May 2026 - 9:46
#homological-algebra
#additive-categories
123
Views
Retraction and direct limit
Published on
14 Apr 2026 - 10:13
#commutative-algebra
#category-theory
#homological-algebra
94
Views
Quasi-coherent $\mathcal{O}_X$-modules
Published on
10 May 2026 - 14:04
#geometry
#algebraic-geometry
#commutative-algebra
#homological-algebra
#arithmetic-geometry
236
Views
Uniqueness in the Snake Lemma.
Published on
10 May 2026 - 18:20
#homological-algebra
#abelian-categories
662
Views
Baer sum of two extensions
Published on
10 May 2026 - 18:05
#homological-algebra
#group-extensions
142
Views
Kernel of morphism abelian category
Published on
17 Apr 2026 - 6:58
#category-theory
#homological-algebra
#abelian-categories
244
Views
The Semisimplicial Homology of a Cone
Published on
10 May 2026 - 13:26
#algebraic-topology
#homological-algebra
#simplicial-complex
444
Views
Is $\mathbb{Q}/\mathbb{Z}$ decomposable?
Published on
11 Apr 2026 - 9:30
#homological-algebra
345
Views
Natural exact sequence associated to a group/module filtration
Published on
10 May 2026 - 13:48
#group-theory
#modules
#homological-algebra
#exact-sequence
212
Views
Homotopy equivalence gives the mapping cone null homotopic?
Published on
13 Apr 2026 - 6:51
#algebraic-topology
#homological-algebra
#homotopy-theory
723
Views
How would one solve Weibel 1.3.1 in a general Abelian category?
Published on
10 May 2026 - 19:25
#proof-verification
#category-theory
#homological-algebra
#alternative-proof
#diagram-chasing
263
Views
Abelian categories linear over a field
Published on
29 Apr 2026 - 12:55
#category-theory
#homological-algebra
#abelian-categories
52
Views
Chain complex of free $k[x.y]$ modules with strange homology group
Published on
11 May 2026 - 9:35
#examples-counterexamples
#homology-cohomology
#homological-algebra
29
Views
Stabilizer of two short exact sequences at the same time
Published on
10 May 2026 - 18:03
#homological-algebra
#exact-sequence
1.4k
Views
What are derived functors for?
Published on
13 May 2026 - 6:37
#homological-algebra
#derived-functors
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