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This tag is used if a reference is needed in a paper or textbook on a specific result.

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Computable subsets of non-standard models of arithmetic

By Tennenbaum's theorem, there exists no computable non-standard model of $\mathsf{PA}$. That is, for any nonstandard model $M$, we cannot define an encoding of the integers $x\in M$ such that $+_M$, …