Dense pairs of o-minimal structures
Volume 157 / 1998
Fundamenta Mathematicae 157 (1998), 61-78 DOI: 10.4064/fm-157-1-61-78
The structure of definable sets and maps in dense elementary pairs of o-minimal expansions of ordered abelian groups is described. It turns out that a certain notion of "small definable set" plays a special role in this description.