* Fibrations of groupoids
@ 2017-03-12 21:23 John Baez
0 siblings, 0 replies; only message in thread
From: John Baez @ 2017-03-12 21:23 UTC (permalink / raw)
To: categories
Dear Category Theorists -
My grad student Kenny Courser is looking for the references where it was
first
shown that:
1) Fibrations of groupoids are preserved by strict pullbacks.
2) For any functor between groupoids f: G -> H, we can find an equivalence
of groupoids g: G -> G' and a fibration f': G' -> H such that f and f'g are
naturally isomorphic.
If anyone could point us in the right direction, it would be greatly
appreciated. Of
course these claims may have first been shown in greater generality, and
that would
be fine too.
Best,
jb
[For admin and other information see: http://www.mta.ca/~cat-dist/ ]
^ permalink raw reply [flat|nested] only message in thread
only message in thread, other threads:[~2017-03-12 21:23 UTC | newest]
Thread overview: (only message) (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2017-03-12 21:23 Fibrations of groupoids John Baez
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).