On certain star versions of the Scheepers property

Abstract

The star versions of the Scheepers property, namely star-Scheepers, strongly star-Scheepers and new star-Scheepers property have been introduced. We explore further ramifications concerning critical cardinalities. Quite a few interesting observations are obtained while dealing with the Isbell-Mrówka spaces, Niemytzki plane and Alexandroff duplicates. The properties like monotonically normal, locally countable cellularity (which is introduced here) play an important role in our investigation. We study games corresponding to the classical and star variants of the Scheepers property which have not been investigated in prior works. Some open problems are also posed.

Iterations and unions of star selection properties on topological spaces

“…Let us first introduce some notation that allows to present these results in an organized manner ‡ . † In [9], the authors also use the idea of unions of size less than d many Hurewicz-type spaces to obtain some results about star-Scheepers spaces.…”