EUDML

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Relatively absolutely countably compact spaces.

Song, Yankui — 2006

Bulletin of the Malaysian Mathematical Sciences Society. Second Series

On relative $1 \frac{1}{2}$ -starLindelöfness.

Song, Yankui; Han, Guangfa; Li, Piyu — 2006

Bulletin of the Malaysian Mathematical Sciences Society. Second Series

On relatively almost Lindelöf subsets

Yankui Song — 2009

Mathematica Bohemica

A subspace $Y$ of a space $X$ is almost Lindelöf (strongly almost Lindelöf) in $X$ if for every open cover $𝒰$ of $X$ (of $Y$ by open subsets of $X$ ), there exists a countable subset $𝒱$ of $𝒰$ such that $Y \subseteq ⋃ {\bar{V} V \in 𝒱}$ . In this paper we investigate the relationships between relatively almost Lindelöf subset and relatively strongly almost Lindelöf subset by giving some examples, and also study various properties of relatively almost Lindelöf subsets and relatively strongly almost Lindelöf subsets.