Motivated by the Ekeland variational principle, we obtained a Metatheorem in 1985-87
stating that some well-known order theoretic fixed point theorems can be equivalently …

According to our long-standing Metatheorem, certain maximum theorems can be
equivalently reformulated to various types of fixed point theorems, and conversely. As …

Some ordered fixed point theorems on metric spaces are equivalent to completeness and
existences of maximal (or minimal) elements, common fixed points, common stationary …

In this paper, the widely used ordering and maximality principles of Haim Brézis and Felix
Browder, together with their proofs, are slightly generalized in content and greatly improved …

The well-known Caristi fixed point theorem has numerous generalizations and
modifications. Recently there have appeared its equivalent dual forms and generalizations …

The Twenty-first Katowice–Debrecen Winter Seminar on Functional Equations and
Inequalities was held in Hotel Kotarz in Brenna, Poland, from February 2 to February 5 …

Motivated by the Ekeland variational principle, we obtained a Metatheorem in 1985-87
stating that some wellknown existence of maximal elements can be equivalently formulated …