Classification Theory Proceedings of the U.S.-Israel Workshop on Mod

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1292 J. T. Baldwin

(Ed.)

Classification Theory Proceedings of the U.S.-Israel Workshop on Model Theory in Mathematical Logic held in Chicago, Dec. 15-19, 1985

Springer-Verlag Berlin Heidelberg New York London Paris Tokyo

Lecture Notes in Mathematics Edited by A. Dold and B. Eckmann

1292 J. T. Baldwin

(Ed.)

Classification Theory Proceedings of the U.S.-Israel Workshop on Model Theory in Mathematical Logic held in Chicago, Dec. 15-19, 1985

Springer-Verlag Berlin Heidelberg New York London Paris Tokyo

Editor John T. Baldwin Department of Mathematics, Statistics and Computer Science University of Illinois Box 4348, Chicago, IL 60680, USA

Mathematics Subject Classification (1980): 03C ISBN 3-540-18674-3 Sprinqer-Verlaq Berlin Heidelberg New York ISBN 0-387-18674-3 Springer-Verlag New York Berlin Heidelberg

This work is subject to copyright. All rights are reserved, whether the whole or part of the material is concerned, specifically the rights of translation, reprinting, re-use of illustrations, recitation, broadcasting, reproduction on microfilms or in other ways, and storage in data banks. Duplication of this publication or parts thereof is only permitted under the provisions of the German Copyright Law of September 9, 1965, in its version of June 24, 1985, and a copyright fee must always be paid. Violations fall under the prosecution act of the German Copyright Law.

© Springer-Verlag Berlin Heidelberg 1987 Printed in Germany Printing and binding: Druckhaus Beltz, HemsbachfBergstr. 2146/3140-543210

PREFACE This volume represents the Proceedings of the U.S.-Israel Binational Workshop on Model Theory in Mathematical Logic: Classification Theory. The conference was held in Chicago on December 15-19, 1985. It was sponsored jointly by the National Science Foundation of the United States and the Ministry of Science of Israel. We greatly appreciate their support. The volume contains several surveys of important recent work (with some new proofs) and research papers. All the papers were refereed by various members of the conference. The immediately following paper surveys the area of Classification Theory and serves as an introduction to this collection.

John T. Baldwin University of Illinois, Chicago May, 1987

TABLE OF CONTENTS J.T. Baldwin Classification Theory 1985

1

J.T. Baldwin and J. Berman Concrete representations of lattices and the fundamental order

24

S. Buechler Classification of small weakly minimal sets 1.

32

Z. Chatzidakis, G.L. Cherlin, G. Srour, S. Shelah, & C. Wood The dimensional order property for separably closed fields

72

V. Harnik Countable or wl-like models of Presburger's arithmetic

89

B. Hart An exposition of aTOP

107

J.T. Baldwin and Charles Steinhorn Exercises on Local Weight

127

U. Hrushovski Locally modular regular types

13 2

H.J. Keisler Choosing elements in a saturated model

165

J. Knight Degrees of models with prescribed Scott set

182

J. Knight & A.H. Lachlan Shrinking, stretching and codes for homogeneous structures

192

L. Manevitz & L. Rowan Freedom vi