Definability of Initial Segments

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In any nonstandard model of Peano arithmetic, the standard part is not first order definable. But we show that in some model the standard part is definable as the unique solution of a formula (P), where P is a unary predicate variable.

Saharon Shelah, Akito Tsuboi

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NDJFL 2002 | Nonstandard Model | Peano Arithmetic | Unary Predicate |

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Added	22 Dec 2010
Updated	22 Dec 2010
Type	Journal
Year	2002
Where	NDJFL
Authors	Saharon Shelah, Akito Tsuboi

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Definability of Initial Segments

NDJFL 2002 | Nonstandard Model | Peano Arithmetic | Unary Predicate |

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