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Finitely based theories

Published online by Cambridge University Press:  12 March 2014

Ehud Hrushovski*
Affiliation:
Department of Mathematics, Princeton University, Princeton, New Jersey 08544 Department of Mathematics, Rutgers University, New Brunswick, New Jersey 08903

Abstract

A stable theory is finitely based if every set of indiscernibles is based on a finite subset. This is a common generalization of superstability and 1-basedness. We show that if such theories have more than one model they must have infinitely many, and prove some other conjectures.

Type
Research Article
Copyright
Copyright © Association for Symbolic Logic 1989

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References

REFERENCES

[Bu] Beuchler, S., The geometry of weakly minimal types, this Journal, vol. 50(1985), pp. 10441053.Google Scholar
[H1] Hrushovski, E., Contributions to stable model theory, Ph.D. thesis, University of California, Berkeley, California, 1986.Google Scholar
[H2] Hrushovski, E., Kueker's conjecture for stable theories, this Journal, vol. 54 (1989), pp. 207220.Google Scholar
[L1] Lachlan, A., Two conjectures on the stability of ℵ0-categorical theories, Fundamenta Mathematicae, vol. 81 (1974), pp. 133145.CrossRefGoogle Scholar
[L2] Lachlan, A., On a property of stable theories, Fundamenta Mathematicae, vol. 77 (1972), pp. 920.CrossRefGoogle Scholar
[M] Makkai, M., A survey of basic stability theory, with particular emphasis on orthogonality and regular types, Israel Journal of Mathematics, vol. 49 (1984), pp. 181238.CrossRefGoogle Scholar
[P1] Pillay, A., Stable theories, pseudoplanes and the number of countable models, Annals of Pure and Applied Logic (to appear).Google Scholar
[Sh1] Shelah, S., Classification theory and the number of non-isomorphic models, North-Holland, Amsterdam, 1978.Google Scholar
[Sh2] Shelah, S., The spectrum problem. I: ℵε-Unsaturated models, the main gap, Israel Journal of Mathematics, vol. 43 (1982), pp. 324356.CrossRefGoogle Scholar