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This tag is used if a reference is needed in a paper or textbook on a specific result.
3
votes
Applications of ZFA-Set Theory
Arnold Oberschelp used urelements in his relative consistency proof of a set theory with a universal set and the singleton function as a set. I followed his example in my variant of Alonzo Church’s “ …
5
votes
How much of ZFC does Quine's New Foundations prove?
While I second (with highly biased motivation) the recommendation of Forster’s book, for questions like this an easier starting point than Forster’s book or Holmes’ articles might be Holmes’ book Elem …