Weak covering properties and infinite games

Abstract

We investigate game-theoretic properties of selection principles related to weaker forms of the Menger and Rothberger properties. For appropriate spaces some of these selection principles are characterized in terms of a corresponding game. We use generic extensions by Cohen reals to illustrate the necessity of some of the hypotheses in our theorems.

Version 2, 20 pages. Removed Theorem 21 of version 1, and replaced it with a reference to a counterexample for one of the two directions. Added an example of a non-Lindelof T_2 space for which TWO has a winning strategy in the almost Rothberger game. Added a diagram in the examples section to illustrate relations among the classes we consider