Geodesic
On hereditary normality of $\omega ^*$, Kunen points and character $\omega_{1}$
Commentationes Mathematicae Universitatis Carolinae, Tome 62 (2021) no. 4, pp. 507-511.

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We show that $\omega ^{*}\setminus \{p\}$ is not normal, if $p$ is a limit point of some countable subset of $\omega ^{*}$, consisting of points of character $\omega _{1}$. Moreover, such a point $p$ is a Kunen point and a super Kunen point.
DOI : 10.14712/1213-7243.2021.032
Classification : 54D15, 54D35, 54D40, 54D80, 54E35, 54G20
Keywords: non-normality point; butterfly point; Kunen point; super Kunen point 
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Logunov, Sergei. On hereditary normality of $\omega ^*$, Kunen points and character $\omega_{1}$. Commentationes Mathematicae Universitatis Carolinae, Tome 62 (2021) no. 4, pp. 507-511. doi : 10.14712/1213-7243.2021.032. http://geodesic.mathdoc.fr/articles/10.14712/1213-7243.2021.032/

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