Hostname: page-component-cd9895bd7-8ctnn Total loading time: 0 Render date: 2024-12-24T12:32:21.328Z Has data issue: false hasContentIssue false

Cofinality of the partial ordering of functions from Ω1 into Ω under eventual domination

Published online by Cambridge University Press:  24 October 2008

Thomas Jech
Affiliation:
Pennsylvania State University
Karel Prikry
Affiliation:
University of Minnesota

Abstract

It is unknown whether there can exist a family of functions from Ω1 into Ω of size less than that dominates all functions from Ω1 into Ω. We show that there is no such family if the continuum is real-valued measurable, and that the existence of such a family has consequences for cardinal arithmetic, and is related to large cardinal axioms.

Type
Research Article
Copyright
Copyright © Cambridge Philosophical Society 1984

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

[1] Banach, S. and Kubatowski, K.. Sur une generalisation du probleme de la mesure. Fund. Math. 14 (1929), 127131.CrossRefGoogle Scholar
[2] Baumgartner, J.. Almost disjoint sets, the dense set problem and the partition calculus. Ann. Math. Logic 9 (1976), 401439.CrossRefGoogle Scholar
[3] Baumgartner, J., Taylor, A. and Wagon, S.. Structural properties of ideals. Dissertationes Math. CXCVN (1982).Google Scholar
[4] Comfort, W. W. and Hager, A. W.. Cardinality of /c-complete Boolean algebras. Pacific J. Math. 40 (1972), 541545.CrossRefGoogle Scholar
[5] Dodd, T. and Jensen, R.. The covering lemma for K. Ann. Math. Logic 22 (1982), 130.CrossRefGoogle Scholar
[6] Jech, T. and Prikry, K.. Ideals over uncountable sets: Application of almost disjoint functions and generic ultrapowers. Mem. Amer. Math. Soc. 18, 214 (1979).Google Scholar
[7] Kunen, K.. Inaccessibility properties of cardinals. Doctoral Dissertation. Stanford (1968).Google Scholar
[8] Mitchell, W.. The core model for sequences of ultrafilters. Math. Proc. Cambridge Philos. Soc. (in the Press).Google Scholar
[9] Pelc, A.. Ideals on the real line and Ulam's problem. Fund Math. 112 (1981), 165170.CrossRefGoogle Scholar
[10] Prikry, K.. Ideals and powers of cardinals. Bull. Amer. Math. Soc. 81 (1975), 907909.CrossRefGoogle Scholar