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140
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What's the correct notion of equivalence in a double category?

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#category-theory #higher-category-theory #groupoids
156
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Why are categories not called monoids (and why are monoids not called... mons?)

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#category-theory #monoid #groupoids
54
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Is the 2-Category of Groupoids Locally Presentable?

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#category-theory #groupoids #locally-presentable-categories #accessible-categories
141
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Exemples of applications of "groupoidification" to linear algebra

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#linear-algebra #geometry #soft-question #groupoids #categorification
367
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From groups to groupoids.

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#reference-request #category-theory #groupoids
190
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Which constructions on a category are still interesting for a groupoid?

Published on
#category-theory #model-theory #groupoids
85
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Relationship between groupoid morphisms and the induced functor on their categories of actions?

Published on
#category-theory #groupoids
535
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Is there a "natural" / "categorical" definition of the "parity" of a permutation?

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#soft-question #category-theory #permutations #groupoids
41
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A certain product of C*-algebras

Published on
#matrices #operator-algebras #groupoids
245
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Groupoid $C^*$ algebra of product groupoid

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#reference-request #tensor-products #operator-algebras #groupoids
666
Views

How do you construct the lifted topology of a groupoid cover?

Published on
#algebraic-topology #category-theory #groupoids
247
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Proving closure of unit space of a Hausdorff groupoid

Published on
#abstract-algebra #topological-groups #groupoids
254
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Constructing the classifying space for a groupoid G

Published on
#sheaf-theory #groupoids #classifying-spaces
215
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Conjugation in a groupoid

Published on
#group-theory #groupoids
368
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Can the integral group ring construction be extended to groupoids in such a way that it provides a functor from Groupoids to Rings?

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#abstract-algebra #category-theory #modules #group-rings #groupoids

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