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On types of CB-rank 1 in simple theories

Published online by Cambridge University Press:  07 October 2008

Anand Pillay
Affiliation:
School of Mathematics, University of Leeds, Leeds LS2 9JT, UK (pillay@maths.leeds.ac.uk)

Abstract

We prove that if M0 is a model of a simple theory, and p(x) is a complete type of Cantor–Bendixon rank 1 over M0, then p is stationary and regular. As a consequence we obtain another proof that any countable model M0 of a countable complete simple theory T has infinitely many countable elementary extensions up to M0-isomorphism. The latter extends earlier results of the author in the stable case, and is a special case of a recent result of Tanovic.

Type
Research Article
Copyright
Copyright © Cambridge University Press 2008

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