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Results tagged with model-theory
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user 156784
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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Definability in countable nonstandard models of Peano arithmetic
I know that every element of $\mathbb{N}$ is definable the standard model of Peano Arithmetic. Does there exist a countable non-standard model of PA where the same is true?
