A wild model of linear arithmetic and discretely ordered modules

Petr Glivický; Pavel Pudlák

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arXiv · 1602.03083

A wild model of linear arithmetic and discretely ordered modules

Petr Glivický·Pavel Pudlák

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Abstract

Linear arithmetics are extensions of Presburger arithmetic (Pr) by one or more unary functions, each intended as multiplication by a fixed element (scalar), and containing the full induction schemes for their respective languages. In this paper we construct a model M of the 2-linear arithmetic LA_2 (linear arithmetic with two scalars) in which an infinitely long initial segment of "Peano multiplication" on M is 0-definable. This shows, in particular, that LA_2 is not model complete in contrast to theories LA_1 and LA_0=Pr that are known to satisfy quantifier elimination up to disjunctions of primitive positive formulas. As an application, we show that M, as a discretely ordered module over the discretely ordered ring generated by the two scalars, is not NIP, answering negatively a question of Chernikov and Hils.

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BibTeX RIS

Petr Glivický, Pavel Pudlák. 2016-02-09. A wild model of linear arithmetic and discretely ordered modules. https://arxiv.org/abs/1602.03083

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