English

Dimension inequality for a definably complete uniformly locally o-minimal structure of the second kind

Logic 2021-04-15 v1

Abstract

Consider a definably complete uniformly locally o-minimal expansion of the second kind of a densely linearly ordered abelian group. Let f:XRnf:X \rightarrow R^n be a definable map, where XX is a definable set and RR is the universe of the structure. We demonstrate the inequality dim(f(X))dim(X)\dim(f(X)) \leq \dim(X) in this paper. As a corollary, we get that the set of the points at which ff is discontinuous is of dimension smaller than dim(X)\dim(X). We also show that the structure is defiably Baire in the course of the proof of the inequality.

Keywords

Cite

@article{arxiv.2002.03078,
  title  = {Dimension inequality for a definably complete uniformly locally o-minimal structure of the second kind},
  author = {Masato Fujita},
  journal= {arXiv preprint arXiv:2002.03078},
  year   = {2021}
}