Semi-proximal spaces and normality

Abstract

We consider the relationship between normality and semi-proximality. We give a consistent example of a first countable locally compact Dowker space that is not semi-proximal, and two ZFC examples of semi-proximal non-normal spaces. This answers a question of Nyikos. One of the examples is a subspace of $(\omega +1)\times {\omega }_1$. In contrast, we show that every normal subspace of a finite power of ${\omega }_1$ is semi-proximal.

18 pages