Soft countable topological spaces

In 1999, Russian researcher Molodtsov proposed the new concept of a soft set which can be considered as a new mathematical approach for vagueness. Soft topological spaces have been studied by some authors in recent years. The purpose of this paper is to investigate some concepts of soft topological spaces which is a generalization to the notion of topological spaces. We give some new concepts in soft topological spaces such as soft first-countable spaces, soft second-countable spaces and soft separable spaces, soft sequential continuity and some important properties of these concepts are investigated