Characterizations of Generalized Open Sets via Generalized Closure and Interior Operators

We discuss the properties of $\delta-$semiopen sets and the relation between the operators, $\delta-$semiclosure and $\delta-$semiinterior, with the closure and interior operators of some well known generalized topologies. Also, we characterize reg- ularopen sets, $\delta-$open sets, $\alpha-$.