The strongly star-Hurewicz game nonimplication

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Let XX be a topological space. The strongly star-Hurewicz property means that for every sequence (Un:n∈N)(\mathcal U_n:n\in\mathbb N) of open covers of XX, there are finite sets An⊆XA_n\subseteq X such that {St⁡(An,Un):n∈N}\{\operatorname{St}(A_n,\mathcal U_n):n\in\mathbb N\} is a γ\gamma-cover of XX. In the strongly star-Hurewicz game, ONE chooses an open cover Un\mathcal U_n in inning nn, and TWO responds with a finite set An⊆XA_n\subseteq X; TWO wins when {St⁡(An,Un):n∈N}\{\operatorname{St}(A_n,\mathcal U_n):n\in\mathbb N\} is a γ\gamma-cover of XX. The strongly star-Hurewicz game conjecture. The strongly star-Hurewicz property of XX need not imply that ONE does not have a winning strategy in the strongly star-Hurewicz game played on XX. The statement concerns the possible failure of the converse to the evident implication from the absence of a winning strategy for ONE to the strongly star-Hurewicz property; the source provides no resolution or example.

References

Primary source

Ljubisa D. R. Kocinac, “Selected results on selection principles”, arXiv:1201.1576 (2012).

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