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Preprint Number 1048

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1048. Merlin Carl
A note on Z as a direct summand of nonstandard models of weak systems of arithmetic

Submission date: 30 May 2016


There are nonstandard models of normal open induction (NOI) for which Z is a direct summand of their additive group. We show that this is impossible for nonstandard models of IE_2.

Mathematics Subject Classification:

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Full text arXiv 1605.09222: pdf, ps.

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