2017•Commentationes Mathematicae Universitatis CarolinaeRequires access

A note on spaces with countable extent

Yan-Kui Song

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Abstract

Let $P$ be a topological property. A space $X$ is said to be star P if whenever $\mathcal U$ is an open cover of $X$, there exists a subspace $A\subseteq X$ with property $P$ such that $X=St(A,\mathcal U)$. In this note, we construct a Tychonoff pseudocompact SCE-space which is not star Lindelöf, which gives a negative answer to a question of Rojas-Sánchez and Tamariz-Mascarúa.

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Let $P$ be a topological property. A space $X$ is said to be star P if whenever $\mathcal U$ is an open cover of $X$, there exists a subspace $A\subseteq X$ with property $P$ such that $X=St(A,\mathcal U)$. In this note, we construct a Tychonoff pseudocompact SCE-space which is not star Lindelöf, which gives a negative answer to a question of Rojas-Sánchez and Tamariz-Mascarúa.

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Available abstract

Let $P$ be a topological property. A space $X$ is said to be star P if whenever $\mathcal U$ is an open cover of $X$, there exists a subspace $A\subseteq X$ with property $P$ such that $X=St(A,\mathcal U)$. In this note, we construct a Tychonoff pseudocompact SCE-space which is not star Lindelöf, which gives a negative answer to a question of Rojas-Sánchez and Tamariz-Mascarúa.

Key concepts: Tychonoff space, Countable set, Subspace topology, Mathematics, Star (game theory), Property (philosophy), Cover (algebra), Space (punctuation)

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