Hostname: page-component-848d4c4894-75dct Total loading time: 0 Render date: 2024-05-03T16:33:38.573Z Has data issue: false hasContentIssue false

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

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

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