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Currently displaying 1 – 6 of 6

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A Note on $\mathcal{R}$ -Maps

Zbigniew Duszyński — 2007

Bollettino dell'Unione Matematica Italiana

Richness of the class of $\mathcal{R}$ -maps [3] is investigated. Several consequences for the theory of quasi- $\mathcal{H}$ -closed spaces are indicated.

Remarks on $\mathcal{S}$ -Closedness in Topological Spaces

Zbigniew Duszyński — 2007

Bollettino dell'Unione Matematica Italiana

Corresponding to [27], some properties of S-closed subspaces and subsets $\mathcal{S}$ -closed relative to a topological space are proved. Conditions under which mappings preserve certain $\mathcal{S}$ -closed subspaces are investigated.