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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 “ …
Flash Sheridan's user avatar
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 …
Flash Sheridan's user avatar