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NDJFL
2002
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NDJFL 2002
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Definability of Initial Segments
13 years 10 months ago
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shelah.logic.at
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 ...
Saharon Shelah, Akito Tsuboi
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