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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.

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Why are model theorists free to use GCH and other semi-axioms? [closed]

Looking into the open problem section of the book Model theory by Chang and Keisler, I noticed that many problems assumed semi-axioms like GCH. I talk about 'semi-axioms' because these "axioms" are sh …