Kominek, Zygfryd Convex functions and some set classes. (English) Zbl 0964.26502 Rocz. Nauk.-Dydakt., Pr. Mat. 13, 187-196 (1993). MSC: 26B25 Convexity of real functions of several variables, generalizations 26B05 Continuity and differentiation questions 90C25 Convex programming PDF BibTeX XML Cite \textit{Z. Kominek}, Rocz. Nauk.-Dydakt., Pr. Mat. 13, 187--196 (1993; Zbl 0964.26502)