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In general topology many strong and weak forms of open and closed sets have been defined
and studied. Govindappa Navalagi introduced the concept of semi αopen sets which is a weaker form of
αopen sets. Semi*αopen set is defined analogously by replacing the closure operator by the
generalized closure operator due to Dunham in the definition of semi αopen sets. In this paper we
introduce a new class of sets, namely semi*αclosed sets, as the complement of semi*αopen sets. We
find characterizations of semi*αclosed sets. We also define the semi*αclosure of a subset. Further we
investigate fundamental properties of the semi*αclosure. We define the semi*αderived set of a subset
and study its properties.
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