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15
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Limits in a Grothendieck fibration

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#category-theory #limits-colimits #fibration #grothendieck-construction
142
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Are there zero morphisms in the category of fields?

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#field-theory #category-theory
756
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Hom, Limits and Colimits

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#category-theory
301
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If the category of elements of a presheave has terminal object, then it is representable.

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#category-theory
194
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diagonal and codiagonal morphisms in additive category

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#abstract-algebra #commutative-algebra #category-theory #modules
128
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Is there a generalization of universal algebra in which inequalities are permitted?

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#abstract-algebra #logic #category-theory #universal-algebra
214
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Condition for pullback to split

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#abstract-algebra #group-theory #category-theory #exact-sequence #diagram-chasing
149
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$\lambda$-accessible categories, unclear proof

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#category-theory #limits-colimits #forgetful-functors #accessible-categories
247
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Canonical morphism from coproduct to product - Questions 1&2: Finite index sets

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#category-theory
268
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Canonical morphism from coproduct to product - Questions 3-6: Infinite index sets

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#category-theory
71
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Are quotients of topological categories also topological categories?

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#general-topology #category-theory
57
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Can composition of morphisms in a category be carried out on any subgraph of a commutative diagram, in-place?

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#category-theory #math-software #function-and-relation-composition #natural-deduction #diagram-chasing
212
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Does the pushout of monomorphisms in Abelian category include into the direct sum?

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#category-theory
138
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Model category of all model categories

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#category-theory #functors #model-categories #fibration #cofibrations
56
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A simple property of the $S$-matrix of a pre-modular category

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#category-theory #monoidal-categories

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