In this paper algebraic properties of convex sets are studied. In the first section we present one of our main results which is an algebraic order cancellation law of convex sets. Then we study properties of convex pairs and reduced pairs mainly within the general frame of commutative semigroups which satisfy the order cancellation law.

Contact details are reproduced from the original publication and may be historical.

Jerzy Grzybowski

Faculty of Mathematics and Computer Science, Adam-Mickiewicz-University, Umultowska 87, 61-614 Poznan, Poland

jgrz@amu.edu.pl

Diethard Pallaschke

Institute of Operations Research, Karlsruhe Institute of Technology, Kaiserstr. 89, 76133 Karlsruhe, Germany

diethard.pallaschke@kit.edu

Hubert Przybycien

Faculty of Mathematics and Computer Science, Adam-Mickiewicz-University, Umultowska 87, 61-614 Poznan, Poland

hubert@amu.edu.pl

R. Urbanski

Faculty of Mathematics and Computer Science, Adam-Mickiewicz-University, Umultowska 87, 61-614 Poznan, Poland

rich@amu.edu.pl

J. Grzybowski, D. Pallaschke, H. Przybycien, R. Urbanski. “Reduced and Minimally Convex Pairs of Sets.” Journal of Convex Analysis 25 (2018), No. 4, 1319–1334.