Closed copies of the rationals

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Closed copies of the rationals. (English). Commentationes Mathematicae Universitatis Carolinae, vol. 28 (1987), issue 1, pp. 137-139

MSC: 54B05, 54E52, 54E65, 54F65 | MR 889775 | Zbl 0614.54028

References:

[H] W. HUREWICZ: Relativ perfekte Teile von Punktmengen und Mengen (A). Fund. Math. 12 (1928), 78-109.

[S] W. SIERPIŇSKI: Sur une propriété topologique des ensembles dénombrables denses en soi. Fund. Math. 1 (1920), 11-16.

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