MATHEMATICA BOHEMICA, Vol. 121, No. 4, pp. 415-424, 1996

# $\alpha$-continuous and $\alpha$-irresolute multifunctions

## Jiling Cao, Ivan L. Reilly

Jiling Cao, Department of Mathematics, The University of Auckland, Private Bag 92019, Auckland, New Zealand. e-mail: cao@math.auckland.ac.nz; Ivan L. Reilly, School of Mathematical & Information Sciences, The University of Auckland, Private Bag 92019, Auckland, New Zealand. e-mail: i.reilly@auckland.ac.nz

Abstract: Recently Popa and Noiri [10] established some new characterizations and basic properties of $\alpha$-continuous multifunctions. In this paper, we improve some of their results and examine further properties of $\alpha$-continuous and $\alpha$-irresolute multifunctions. We also make corrections to some theorems of Neubrunn [7].

Keywords: upper (lower) $\alpha$-continuous, upper (lower) $\alpha$-irresolute, strongly $\alpha$-closed graph, almost compact, almost paracompact

Classification (MSC 1991): 54C60, 54E55

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