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A Note on Subgroups of the Automorphism Group of a Saturated Model, and Regular Types

A. Pillay
The Journal of Symbolic Logic
Vol. 54, No. 3 (Sep., 1989), pp. 858-864
DOI: 10.2307/2274747
Stable URL: http://www.jstor.org/stable/2274747
Page Count: 7
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
A Note on Subgroups of the Automorphism Group of a Saturated Model, and Regular Types
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Abstract

Let M be a saturated model of a superstable theory and let $G = \operatorname{Aut}(M)$. We study subgroups H of G which contain G(A), A the algebraic closure of a finite set, generalizing results of Lascar [L] as well as giving an alternative characterization of the simple superstable theories of [P]. We also make some observations about good, locally modular regular types p in the context of p-simple types.

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