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Model theory is the branch of mathematical logic which deals with the connection between a formal language and its interpretations, or models.

7 votes

Constructible models of New Foundations?

You can't do it for NF, but there is a good notion of constructible model of the theory CUS of Church, that has a universal set. But that's really just a trick of the light, since the big sets of CU …
Thomas Forster's user avatar