A model-theoretic counterpart to Moishezon morphisms

Abstract

In this note a natural strengthening of internality motivated by complex geometry, being "Moishezon" to a set of types, is introduced. Under the hypothesis of Pillay's canonical base property, and using results of Chatzidakis, a criterion is given for when a finite U-rank stationary type that is internal to a nonmodular minimal type is in fact Moishezon to the set of all nonmodular minimal types. This result is a model-theoretic analogue of (a special case of) Campana's "first algebraicity criterion". Other related abstractions from complex geometry, including "coreductions" and "generating fibrations" are also discussed.