Chawalit Boonpok

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A new class of multifunctions, called upper lower βμ X , μ Y-continuous multifunctions, has been defined and studied. Some characterizations and several properties concerning upper lower βμ X , μ Y-continuous multifunctions are obtained. The relationships between upper lower βμ X , μ Y-continuous multifunctions and some known concepts are also discussed.
The aim of this paper is to introduce and study semi-open sets in biclosure spaces. We define semi-continuous maps and semi-irresolute maps and investigate their behavior. Moreover, we introduce pre-semiopen maps in biclosure spaces and study some of their properties.
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