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On classes closed under unions of chains

Published online by Cambridge University Press:  12 March 2014

Douglas E. Miller
Douglas E. Miller*
Affiliation:
Yale University, New Haiven, Connecticut 06520
*
University of Illinois at Chicago Circle, Chicago, IL 60680
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Abstract

We improve a general theorem of J. A. Makowsky which characterizes, for a wide class of languages, those sentences θ such that both Mod(θ) and Mod(¬θ) are closed under unions of chains.

Type
Research Article
Information
The Journal of Symbolic Logic , Volume 44 , Issue 1 , March 1979 , pp. 29 - 31
Copyright
Copyright © Association for Symbolic Logic 1979

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References

BIBLIOGRAPHY

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