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May 10, 2021 at 18:34 comment added Paul Taylor For categories with display maps, Chapter VIII of my book is a much better account. For universes, the Andy Pitts' paper on Russell's paradox that also has my name on it, is probably the best early reference.
May 6, 2021 at 19:28 history edited varkor CC BY-SA 4.0
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May 6, 2021 at 19:21 comment added varkor @PaulTaylor: I should have thought to look there, thanks! I shall add a reference imminently.
May 6, 2021 at 19:16 comment added Paul Taylor Somebody introduced categories with display maps and this definition of universes in his thesis in 1987.
May 6, 2021 at 19:08 history answered varkor CC BY-SA 4.0