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A note on SI-spaces and MI-spaces

Ponomarev S. P.

Scientific Issues of Jan Długosz University in Częstochowa. Mathematics

2010

Vol. 15

99--107

We show that if there exists a second κ-category (or κ-Baire) SI-space, then there exists a second κ-category (resp. κ-Baire) MI-space. Next we discuss some properties of real functions on such spaces.

A criterion for local resolvability of a space and the ω-problem

Ponomarev S. P.

Journal of Applied Analysis

2007

Vol. 13, nr 1

83-96

The notion of the resolvability of a topological space was introduced by E. Hewitt [8]. Recently it was understood that this notion is also important in the study of ω)-primitives, especially in the case of nonmetrizable spaces. In the present paper a criterion for the resolvability of a topological space at a point ("local resolvability") is given. This criterion, stated in terms of oscillation and quasicontinuity, permits to conclude, for instance, that on irresolvable spaces no positive continuous real-valued function has an ω-primitive. The result is strenghtened in the case of SI-spaces. It is also shown that every non- negative upper semicontinuous function on a resolvable Baire space has an ω)-primitive.