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Quasicontinuous selections of upper continuous set-valued mappings. (English) Zbl 1097.54023

In this paper a Matejdes theorem on quasicontinuous selection is extended to the case of upper Baire continuous set valued mappings with nonempty compact values \(T:X\rightarrow 2^{Y}\), where \(X\) is an arbitrary topological space and \(Y\) a regular \(T_{1}\) space. Moreover, the authors prove a quasicontinuous selection theorem for strongly injective upper semicontinuous set-valued mappings with nonempty closed values.

MSC:

54C65 Selections in general topology
54C60 Set-valued maps in general topology
26E25 Set-valued functions
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