Our scientific collaboration began about 35 years ago, when both of us had just finished our
Ph. D. Theses. The first article which we submitted together dealt with a certain type of …

This paper deals with approximate solutions of a nonsmooth semi-infinite programming with
multiple interval-valued objective functions. We first introduce four types of approximate …

This paper has a twofold focus. The mathematical aspect of the paper shows that new and
existing quasimetric and weak-distance versions of Ekeland's variational principle are …

This paper deals with approximate solutions of an optimization problem with interval-valued
objective function. Four types of approximate solution concepts of the problem are proposed …

This paper investigates some properties of approximate efficiency in variable ordering
structures where the variable ordering structure is given by a special set valued map. We …

This paper addresses a large class of vector optimization problems in infinite-dimensional
spaces with respect to two important binary relations derived from domination structures …

This paper is devoted to new versions of Ekeland's variational principle in set optimization
with domination structure, where set optimization is an extension of vector optimization from …

Recently, in many papers intensity modulated radiotherapy treatment problems are studied
as multi-criteria optimization problems with respect to a constant ordering cone. In these …

Ordering structures play a fundamental role in many mathematical areas. These include
important topics in optimization theory such as vector optimization and set optimization, but …

We consider set optimization problems governed by the upper set less relation introduced
by Kuroiwa. We extend some known results from the literature to a setting that includes (a) …