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Jul 22, 2012 at 10:42 comment added David Roberts Note that we might have not just a category but an $n$-fold category for some $n$ which is the number of currently known different kinds of morphisms between models/universes, or at least the ones we are interested in for the purposes of the exercise (see ncatlab.org/nlab/show/n-fold+category).
Oct 12, 2011 at 20:18 history answered Joel David Hamkins CC BY-SA 3.0