Countable Fan Tightness and Selection Games in Group-Valued Function Spaces

Abstract

Game-theoretic characterizations of selection principles provide a powerful framework for analyzing covering properties through strategic interactions. For a Tychonoff space $X$ and a non-trivial metrizable arc-connected topological group $G$, we prove that Player~II has a winning strategy in the $\hat{I}\text{c◯}$-Menger game on $X$ if and only if Player~II has a winning strategy in the countable fan tightness game on $C_p(X,G)$ at the identity function. The analogous equivalence is established between the $\hat{I}\text{c◯}$-Rothberger game on $X$ and the countable strong fan tightness game on $C_p(X,G)$ at the identity function. These results extend the game-theoretic characterizations of Clontz from $G=\mathbb{R}$ to arbitrary metrizable arc-connected groups, and lift the selection-principle equivalences of Kočinac to the game-theoretic setting. As consequences, we establish that the game-theoretic tightness properties of $C_p(X,G)$ are independent of $G$, preserved under $G$-equivalence, and remain valid for Markov strategies.

11 pages. Comments are welcome