Some observations on a clopen version of the Rothberger property
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Manoj Bhardwaj
manojmnj27@gmail.com
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Alexander V. Osipov
oab@list.ru
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https://doi.org/10.56754/0719-0646.2502.161Abstract
In this paper, we prove that a clopen version \(S_1(\mathcal{C}_\mathcal{O}, \mathcal{C}_\mathcal{O})\) of the Rothberger property and Borel strong measure zeroness are independent. For a zero-dimensional metric space \((X,d)\), \(X\) satisfies \(S_1(\mathcal{C}_\mathcal{O}, \mathcal{C}_\mathcal{O})\) if, and only if, \(X\) has Borel strong measure zero with respect to each metric which has the same topology as \(d\) has. In a zero-dimensional space, the game \(G_1(\mathcal{O}, \mathcal{O})\) is equivalent to the game \(G_1(\mathcal{C}_\mathcal{O}, \mathcal{C}_\mathcal{O})\) and the point-open game is equivalent to the point-clopen game. Using reflections, we obtain that the game \(G_1(\mathcal{C}_\mathcal{O}, \mathcal{C}_\mathcal{O})\) and the point-clopen game are strategically and Markov dual. An example is given for a space on which the game \(G_1(\mathcal{C}_\mathcal{O}, \mathcal{C}_\mathcal{O})\) is undetermined.
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Mathematics Subject Classification:
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- Ministry of Science and Higher Education of the Russian Federation
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