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15
Math.TechQA.Club
2026-04-12 00:14:18
45
Views
Confusion about the definition of finite shape category in Jeffrey Strom's book
Published on
12 Apr 2026 - 0:14
#category-theory
35
Views
Number of functors from a small category to an arbitrary category
Published on
17 Apr 2026 - 2:35
#category-theory
513
Views
Every slice of a presheaf category is again a presheaf category
Published on
17 Apr 2026 - 8:08
#category-theory
460
Views
the concept of class (category theory)
Published on
15 Apr 2026 - 16:25
#category-theory
#set-theory
71
Views
Fibrations are thought of as epimorphisms
Published on
25 Mar 2026 - 4:39
#category-theory
#model-categories
#fibration
#monomorphisms
#epimorphisms
364
Views
Product functor and diagonal functor
Published on
16 Apr 2026 - 1:08
#abstract-algebra
#category-theory
#adjoint-functors
#functors
330
Views
Closed inclusion
Published on
26 Apr 2026 - 2:56
#category-theory
#model-categories
#fibration
#cofibrations
94
Views
What is the coequalizer of a pair of projections?
Published on
14 Apr 2026 - 20:02
#category-theory
113
Views
Showing some object is initial
Published on
12 Apr 2026 - 23:11
#category-theory
#model-theory
#topos-theory
515
Views
Interpreting a Group Action as a Functor
Published on
26 Mar 2026 - 1:27
#abstract-algebra
#group-theory
#category-theory
#group-actions
#functors
118
Views
The Eckmann-Hilton argument gives us an isomorphism between $Mon(Mon(C))$ and $CoMon(C)$ or just an equivalence?
Published on
24 Apr 2026 - 8:47
#category-theory
#monoidal-categories
#braidings
117
Views
Single-sorted (arrows-only) definition of infinity-category
Published on
25 Apr 2026 - 11:14
#category-theory
#foundations
#higher-category-theory
83
Views
Is there a notion of a smallest category satisfying some requirements?
Published on
15 Apr 2026 - 13:48
#category-theory
167
Views
Understanding diffeomorphism concept.
Published on
25 Mar 2026 - 15:37
#differential-geometry
#category-theory
#smooth-manifolds
#diffeomorphism
179
Views
Is it true that an arbitrary coproduct of compact objects is compact?
Published on
11 Apr 2026 - 10:49
#category-theory
#homological-algebra
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