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15
314
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Example of an additive functor admitting no right derived functor

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#category-theory #homological-algebra #derived-functors #derived-categories
121
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About the definition of coproducts of a cloven fibration

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#category-theory
78
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Why is $R\mapsto\operatorname{End}_{R-lin}(R\otimes_k V)$ representable by $\operatorname{Sym}(V\otimes_k V^\vee)$?

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#category-theory #modules #representation-theory #algebraic-groups #functors
595
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Pushout of a diagram as a cokernel

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#category-theory #limits-colimits
388
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Direct limit of directed system of countable subset

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#general-topology #category-theory
1k
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References to supplement Goldblatt's "Topoi"

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#reference-request #category-theory #exponentiation #topos-theory #diagram-chasing
816
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What are the different approaches to formalizing type theory in the usual model-theoretic context?

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#category-theory #model-theory #type-theory #homotopy-type-theory
150
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A topology on algebras that coincides with a certain idea of density

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#abstract-algebra #general-topology #category-theory #universal-algebra
89
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Vertical and diagonal colimits

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#category-theory
200
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Character of the subobject classifier in the topos of $\mathbf{M}$-sets.

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#category-theory #monoid #topos-theory
133
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Has anyone heard|seen the word "coconcept"? If so, where? And what does it mean?

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#reference-request #category-theory #terminology
97
Views

Where is it explicitly stated that the terms "contravariant" and "covariant" should not be used for vectors?

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#differential-geometry #reference-request #category-theory #terminology
35
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Invariance of products of objects in a category

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#category-theory
1.6k
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Adjoints to the Evaluation functors

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#category-theory #adjoint-functors
174
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Tensor product classifies cooperating arrows?

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#abstract-algebra #category-theory #tensor-products #monoidal-categories #universal-property

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