Maximal Chains in ${}^\omega\omega$ and Ultrapowers of the Integers

by Shelah and Steprans. [ShSr:465]
Archive for Math Logic, 1993
Various questions posed by P. Nyikos concerning ultrafilters on omega and chains in the partial order (omega,<^*) are answered. The main tool is the oracle chain condition and variations of it. (Note: Corrections in [Sh:465a])

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