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

1 vote
1 answer
212 views

gluing bundles as a 2-colimit

Is the gluing of bundles from not-necessarily trivial bundles just some kind of 2-colimit?
Mozibur Ullah's user avatar
1 vote
Accepted

gluing bundles as a 2-colimit

not my answer, but David Carchedi's answer in a comment: 'What you might be thinking is, the category of principal bundles over a fixed base is a 2-colimit over all covers of the base (or some cofina …
Mozibur Ullah's user avatar
11 votes
2 answers
2k views

Are grothendieck universes enough for the foundations of category theory?

Grothendieck universes are equivalent to ZFC+a strongly inaccessible cardinal. This is low on the large cardinal axiom list. Is it enough to place category theory on a firm foundational basis, and how …
Mozibur Ullah's user avatar
2 votes
1 answer
857 views

Where should one go to learn about triangulated categories?

Lurie's book, higher topos theory describes a new notion of a triangulated category, which is apparently much more natural than the usual definition. Obviously by now a great deal of work has been don …
Mozibur Ullah's user avatar
6 votes

Is Mac Lane still the best place to learn category theory?

I found the Catsters on YouTube divinely useful. John Baez, in his not so weekly blog, inspiring. The n-category cafe, to keep you going. Eugenia Cheng's notes on category theory was tremendously u …