This article is cited in 6 papers

Spaces with a Souslin and a shanin condition

B. È. Shapirovskii


Abstract: If $X$ is a regular hereditary Souslin space and $x\in X$ then either there exists a sequence $\{x_n:n=1,2,\dots\}\subset X\{x\}$ such that $x\in[{x_n:n=1,2,\dots}]$, or the pseudocharacter of $x$ in $X$ is no greater than countable. In other words, if $X$ is a hereditary Souslin bicompactum which is a $\chi$-space, then $X$ is a Frechet–Urysohn space.

 English version: Mathematical Notes, 1974, 15:2, 161–164

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