Sergei Logunov
On non-normality points and metrizable crowded spaces

Comment.Math.Univ.Carolin. 48,3 (2007) 523-527.

Abstract:$\beta X-\{p\}$ is non-normal for any metrizable crowded space $X$ and an arbitrary point $p\in X^{*}$.

Keywords: nice family, $p$-filter, $p$-ultrafilter, projection, non-normality point, butterfly-point
AMS Subject Classification: 54D35