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Variations on ◊

Published online by Cambridge University Press:  12 March 2014

Keith J. Devlin
Keith J. Devlin*
Affiliation:
University of Lancaster, Lancaster LA1 4YL, England
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Abstract

Various equivalents and weakenings of the combinatorial principle ◊ are considered. The paper contains both absolute results and consistency results. Also included is a new characterisation of the notion of a stationary subset of ω1.

Information

Type
Research Article
Information
The Journal of Symbolic Logic , Volume 44 , Issue 1 , March 1979, pp. 51 - 58
Copyright
Copyright © Association for Symbolic Logic 1979

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References

REFERENCES

[1]Devlin, K. J., Aspects of constructibility, Lecture Notes in Mathematics, no. 354, Springer-Verlag, Berlin and New York, 1973.Google Scholar
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