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15
Math.TechQA.Club
2026-04-12 20:10:49
382
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Proving distributivity of Heyting algebras with the Yoneda lemma.
Published on
12 Apr 2026 - 20:10
#category-theory
#order-theory
#lattice-orders
454
Views
More than one pair of "nice" adjoint functors between different concrete categories
Published on
25 Mar 2026 - 14:22
#soft-question
#category-theory
#adjoint-functors
4.1k
Views
Additive exact functors preserve homology of modules
Published on
10 Apr 2026 - 23:09
#abstract-algebra
#category-theory
#modules
275
Views
Contravariant functor properties
Published on
12 Apr 2026 - 3:47
#abstract-algebra
#category-theory
#modules
189
Views
About certain regular epimorphisms in a Grothendieck Topos
Published on
11 Apr 2026 - 5:20
#category-theory
#topos-theory
652
Views
Sequences or 'chains' of adjoint functors
Published on
25 Mar 2026 - 15:57
#category-theory
#adjoint-functors
358
Views
Subcategories of $\mathbf{Top}$ which are closed under arbitrary products and coproducts
Published on
13 Apr 2026 - 17:05
#general-topology
#category-theory
267
Views
Geometric Homotopy as Chain Homotopy
Published on
12 Apr 2026 - 9:21
#algebraic-topology
#category-theory
#homotopy-theory
319
Views
Constructing pullback and pushout problem
Published on
11 Apr 2026 - 10:16
#abstract-algebra
#category-theory
#modules
5.5k
Views
"Internal" and "external" in maths, and also in vector spaces
Published on
12 Apr 2026 - 23:40
#linear-algebra
#abstract-algebra
#category-theory
2.9k
Views
Direct limits in the category of modules
Published on
11 Dec 2014 - 6:03
#abstract-algebra
#category-theory
82
Views
If $f= \mathrm{ker}\,g$, then $g = \mathrm{coker}\,f$?
Published on
03 Apr 2026 - 17:10
#category-theory
#homological-algebra
#abelian-categories
180
Views
Module of differentials in the functorial approach to schemes and quasi-coherent modules
Published on
25 Mar 2026 - 19:11
#algebraic-geometry
#differential-geometry
#category-theory
#quasicoherent-sheaves
132
Views
Why is the coproduct in $\mathsf{Grp}$ so different from the coproduct in $\mathsf{Ab}$?
Published on
09 Apr 2026 - 17:15
#category-theory
#abelian-categories
60
Views
Simple problem about morphism in abelian categories
Published on
13 Apr 2026 - 5:41
#abstract-algebra
#category-theory
#modules
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