List questions from groupoids

Published on 25 Mar 2026 - 9:24

165

Views

Proper effective étale groupoid gives an effective orbifold

Published on 01 Apr 2026 - 0:52

138

Views

What natural monoidal structure and braiding exists on the category of modules of the convolution algebra of an action groupoid?

Published on 28 Apr 2026 - 20:10

279

Views

groupoids and localization in categories

Published on 01 Apr 2026 - 0:57

84

Views

If functions compose both ways to make automorphisms, are they isomorphisms?

Published on 01 Apr 2026 - 0:57

384

Views

How are groupoids richer structures than sets of groups?

Published on 19 Apr 2026 - 4:23

229

Views

Differentiable stacks and morita morphism

Published on 10 May 2026 - 16:09

554

Views

Pushforward of a representation?

Published on 10 May 2026 - 9:52

172

Views

Action groupoid as $G\rightrightarrows \textrm{Bij}(X)$?

Published on 07 May 2026 - 19:18

179

Views

The Image of a Groupoid Morphism is Not a Subgroupoid

Published on 18 May 2016 - 17:29

189

Views

Characterization of internal groupoids via pullbacks

Published on 23 Apr 2026 - 10:00

516

Views

Correspondence $\{$principal $G$-bundles on $M\}\leftrightarrow\{$conjugacy classes of homomorphisms $\pi_1(M)\to G\}$

Published on 01 May 2026 - 14:43

399

Views

In a groupoid, do any two objects have a morphism between them?

Published on 25 Mar 2026 - 9:22

935

Views

Connected groupoids and action groupoids

Published on 25 Mar 2026 - 9:22

466

Views

Existence of a certain functor $F:\mathrm{Grpd}\rightarrow\mathrm{Grp}$

Published on 25 Mar 2026 - 9:25

List Question

Morphism from a groupoid to the action groupoid?

Proper effective étale groupoid gives an effective orbifold

What natural monoidal structure and braiding exists on the category of modules of the convolution algebra of an action groupoid?

groupoids and localization in categories

If functions compose both ways to make automorphisms, are they isomorphisms?

How are groupoids richer structures than sets of groups?

Differentiable stacks and morita morphism

Pushforward of a representation?

Action groupoid as $G\rightrightarrows \textrm{Bij}(X)$?

The Image of a Groupoid Morphism is Not a Subgroupoid

Characterization of internal groupoids via pullbacks

Correspondence $\{$principal $G$-bundles on $M\}\leftrightarrow\{$conjugacy classes of homomorphisms $\pi_1(M)\to G\}$

In a groupoid, do any two objects have a morphism between them?

Connected groupoids and action groupoids

Existence of a certain functor $F:\mathrm{Grpd}\rightarrow\mathrm{Grp}$

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