Selective game versions of countable tightness with bounded finite selections

preprint2016arXivOpen access

Abstract

For a topological space XX and a point x∈Xx \in X, consider the following game -- related to the property of XX being countably tight at xx. In each inning n∈ωn\inω, the first player chooses a set AnA_n that clusters at xx, and then the second player picks a point an∈Ana_n\in A_n; the second player is the winner if and only if x∈{an:n∈ω}‾x\in\overline{\{a_n:n\inω\}}. In this work, we study variations of this game in which the second player is allowed to choose finitely many points per inning rather than one, but in which the number of points they are allowed to choose in each inning has been fixed in advance. Surprisingly, if the number of points allowed per inning is the same throughout the play, then all of the games obtained in this fashion are distinct. We also show that a new game is obtained if the number of points the second player is allowed to pick increases at each inning.

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