4 research outputs found
Characterizations of modules definable in o-minimal structures
Let be an o-minimal expansion of a densely linearly ordered set and be a ring definable in . In this article, we develop two techniques for the study of characterizations of -modules definable in . The first technique is an algebraic technique. More precisely, we show that every -module definable in is finitely generated. For the other technique, we prove that every -module definable in admits a unique definable -module manifold topology. As consequences, we obtain the following: (1) if is finite, then a module is isomorphic to an -module definable in if and only if is finite; (2) if is an infinite ring without zero divisors, then a module is isomorphic to an -module definable in if and only if is a finite dimensional free module over ; and (3) if is an expansion of an ordered divisible abelian group and is an infinite ring without zero divisors, then every -module definable in is definably connected with respect to the unique definable -module manifold topology