Kominek, Zygfryd; Wilczyński, Władysław On sets for which the difference set is the whole space. (English) Zbl 1159.28300 Rocz. Nauk.-Dydakt., Pr. Mat. 16, 45-51 (1999). MSC: 28A12 PDF BibTeX XML Cite \textit{Z. Kominek} and \textit{W. Wilczyński}, Rocz. Nauk.-Dydakt., Pr. Mat. 16, 45--51 (1999; Zbl 1159.28300)
Kominek, Zygfryd Convex functions and some set classes. (English) Zbl 0964.26502 Rocz. Nauk.-Dydakt., Pr. Mat. 13, 187-196 (1993). MSC: 26B25 26B05 90C25 PDF BibTeX XML Cite \textit{Z. Kominek}, Rocz. Nauk.-Dydakt., Pr. Mat. 13, 187--196 (1993; Zbl 0964.26502)