In this paper, we define soft -open sets and strongly soft -open sets as two new classes of soft sets. We study the natural properties of these types of soft sets and we study the validity of the exact versions of some known results in ordinary topological spaces regarding -open sets in soft topological spaces. Also, we study the relationships between the -open sets of a given indexed family of topological spaces and the soft -open sets (resp. strongly soft -open sets) of their generated soft topological space. These relationships form a biconditional logical connective which is a symmetry. As an application of strongly soft -open sets, we characterize soft Lindelof (resp. soft weakly Lindelof) soft topological spaces.
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