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For questions involving one or more categorical dimensions, or involving homotopy coherent categorical structures.

3 votes
1 answer
342 views

Is the notion of a 2-category introduced to fix/forget the size issues in the definition of ...

A category $\mathcal{C}$ consists of pair of classes $(\mathcal{C}_0, \mathcal{C}_1)$, along with maps $$\mathcal{C}_1\times_{\mathcal{C}_0}\mathcal{C}_1\rightarrow \mathcal{C}_1\rightrightarrows \mat …
Praphulla Koushik's user avatar
1 vote

Connections on principal bundles via stacks?

I am not sure if this has to be an answer or a comment. I will change it to comment if needed. Please see section $6$ of Parallel Transport on Principal Bundles over Stacks . Given a Lie group $G$, …
Praphulla Koushik's user avatar
9 votes

Understanding the definition of stacks

What categories fibered in groupoids over $\mathcal{C}$ corresponds to stacks? A category fibered in groupoids over $\mathcal{C}$ is given by a functor $p_{\mathcal{F}}:\mathcal{F}\rightarrow \ma …
Praphulla Koushik's user avatar
2 votes
1 answer
229 views

references to learn the general theory Lie $\infty$-groupoids and Lie $\infty$-algebroids

Kirill Mackenzie has a book on the general theory of Lie groupoids and Lie algebroids. Is there such a reference for the general theory of Lie $\infty$-groupoids and Lie $\infty$-algebroids; that cove …
Praphulla Koushik's user avatar
1 vote

Why the third stage of Cech nerve a Lie 2-groupoid?

This is not an answer, just too long for a comment (could be slightly misleading). This is precisely what Dimitri Pavlov has mentioned in his comment. In general, the description of $2$-category $\mat …
Praphulla Koushik's user avatar