A wild model of linear arithmetic and discretely ordered modules
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.
Cite
@article{arxiv.1602.03083,
title = {A wild model of linear arithmetic and discretely ordered modules},
author = {Petr Glivický and Pavel Pudlák},
journal= {arXiv preprint arXiv:1602.03083},
year = {2017}
}
Comments
revision: minor changes in the exposition, some references added