Natkaniec, Tomasz On points of qualitative semicontinuity. (English) Zbl 0624.26006 Čas. Pěstování Mat. 110, 337-342 (1985). The author proves, under the assumption that every subset of R with cardinality less than continuum is of first category (e.g. under CH or MA), a generalization of a result of Z. Grande [Fundam. Math. 126, 1-13 (1985; preceding review)]. Reviewer: Á.Császár Cited in 1 ReviewCited in 1 Document MSC: 26A15 Continuity and related questions (modulus of continuity, semicontinuity, discontinuities, etc.) for real functions in one variable 03E50 Continuum hypothesis and Martin’s axiom Keywords:ZFM 624.26005; qualitative semicontinuity PDF BibTeX XML Cite \textit{T. Natkaniec}, Čas. Pěstování Mat. 110, 337--342 (1985; Zbl 0624.26006) Full Text: EuDML OpenURL