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15
199
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Adjunction between Kan complexes and Groupoids

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#category-theory #homotopy-theory #groupoids
40
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Categories as a generalisation of multifunctions

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#reference-request #category-theory
255
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Show that a map f: X → Y in a category is a monomorphism if and only if the following square is a pullback:

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#category-theory
390
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Zero and inverse element in abelian group of extensions of modules

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#category-theory #modules #homology-cohomology #exact-sequence
804
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Countably dimensional vector space as a limit

Published on
#linear-algebra #vector-spaces #category-theory #limits-colimits
162
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Prove that the following commutative square has a monomorphism

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#category-theory
240
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Examples of Isbell-self-dual objects

Published on
#category-theory #examples-counterexamples #duality-theorems
115
Views

Universal object in dual category

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#category-theory
55
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On subobjects of a finite-dimensional vector space

Published on
#vector-spaces #category-theory #monoidal-categories
66
Views

Equivalence of categories

Published on
#category-theory
939
Views

Is the coevaluation map of finite-dimensional vector spaces always a mono?

Published on
#vector-spaces #category-theory #monoidal-categories
63
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Completeness of the category of boolean algebras

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#reference-request #category-theory
28
Views

Condition for category of algebras over a monoid in a monoidal category to be regular

Published on
#category-theory #monoidal-categories
74
Views

Question on isomorphic objects in Set category.

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#category-theory
129
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Is Singular homology the "largest" possible homology theory?

Published on
#algebraic-topology #category-theory #homological-algebra #homology-cohomology

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