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Internal groups in Set/I

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#category-theory
604
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Question of category of rings

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#ring-theory #category-theory
645
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Does the empty category exist?

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#category-theory
49
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Equivalence of categories of open sets and sheaves.

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#category-theory #sheaf-theory
52
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Question about slice category from Allufi chapter 0

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#category-theory
389
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Understanding torsors and semidirect products of groups

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#abstract-algebra #group-theory #category-theory #intuition #semidirect-product
257
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Is "generalized" singular homology/cohomology a thing? If not, why not?

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#abstract-algebra #soft-question #category-theory #homological-algebra #universal-algebra
2k
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How is a morphism different from a function

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#functions #category-theory #morphism
365
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homomorphism on Rees algebra

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#ring-theory #category-theory
384
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Homomorphism between profinite groups is continuous if and only if the preimage of all open normal subgroups is open

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#category-theory #profinite-groups
395
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Short exact sequence $0 \to A \to B \to C \to 0$ has invariant in $\text{Ext}^1(C,A)$

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#category-theory #modules #homological-algebra #invariance
73
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2-Functor preserves left-exactness of localization

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#category-theory #adjoint-functors #2-categories
565
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Composition of left kan extensions

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#category-theory
243
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Notation for universal morphism

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#notation #category-theory #tensor-products #universal-property
64
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Showing morphism is epi in a category with equalisers

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#category-theory

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