Remark on the Failure of Martin's Axiom

Avner Landver

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Remark on the Failure of Martin's Axiom

Avner Landver

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Abstract

Let m be the least cardinal k such that MA(k) fails. The only known model for "m is singular" was constructed by Kunen. In Kunen's model cof(m)=omega_1. It is unknown whether "omega_1 < cof(m) < m" is consistent. The purpose of this paper is to present a proof of Kunen's result and to identify the difficulties of generalizing this result to an arbitrary uncountable cofinality.

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Avner Landver. 1992-07-31. Remark on the Failure of Martin's Axiom. https://arxiv.org/abs/math/9207205

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