List questions from groupoids

Published on 26 Sep 2020 - 6:30

869

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Simplicial sets which are not Kan complexes

Published on 29 Sep 2020 - 14:28

98

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Cancellation law in a Lie groupoid

Published on 22 Mar 2026 - 6:25

87

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How units of a Lie groupoid act on a manifold?

Published on 23 Feb 2026 - 1:07

47

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Help with understanding the definition of a Hodge groupoid

Published on 26 Oct 2020 - 14:39

124

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Definition of Haar systems, especially for groupoids $C^*$-algebra

Published on 30 Oct 2020 - 13:17

107

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Homotopy cardinality of weak quotients

Published on 06 Nov 2020 - 9:14

73

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Group isomorphism between identity morphisms of fundamental groupoid and fundamental group of topological space

Published on 21 Nov 2020 - 22:15

55

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Name for semigroupoid-like structure applicable to a water flow network in graph theory

Published on 26 Nov 2020 - 20:39

62

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Notation for the scope of definition of a partial binary operation of a groupoid

Published on 23 Feb 2026 - 4:56

230

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classifying space induces a equivalence of categories between PBun$_G(M)$ and $\Pi(M,BG)$ for finite groups $G$

Published on 18 Dec 2020 - 20:18

72

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What's the Internal language of a groupoid?

Published on 22 Dec 2020 - 22:13

57

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The small concrete category $C = (\mathbb{Z_2}, +)$?

Published on 25 Mar 2026 - 14:25

140

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Proving that a groupoid is a group, knowing the following properties

Published on 30 Dec 2020 - 10:37

358

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Functor From Category of Covering Spaces to Category of Sets Equipped With An Action By The Fundamental Groupoid

Published on 25 Mar 2026 - 10:59

List Question

Every normal subgroupoid is the kernel of a groupoid morphism

Simplicial sets which are not Kan complexes

Cancellation law in a Lie groupoid

How units of a Lie groupoid act on a manifold?

Help with understanding the definition of a Hodge groupoid

Definition of Haar systems, especially for groupoids $C^*$-algebra

Homotopy cardinality of weak quotients

Group isomorphism between identity morphisms of fundamental groupoid and fundamental group of topological space

Name for semigroupoid-like structure applicable to a water flow network in graph theory

Notation for the scope of definition of a partial binary operation of a groupoid

classifying space induces a equivalence of categories between PBun$_G(M)$ and $\Pi(M,BG)$ for finite groups $G$

What's the Internal language of a groupoid?

The small concrete category $C = (\mathbb{Z_2}, +)$?

Proving that a groupoid is a group, knowing the following properties

Functor From Category of Covering Spaces to Category of Sets Equipped With An Action By The Fundamental Groupoid

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