Zygfryd Kominek, a mathematician, a teacher, a friend
Abstract
Dedicated to Professor Zygryd Kominek on his 75th birthday.
Keywords
Steinhaus and Piccard type theorems; Smítal’s Lemma; functional equations; semilinear topology; stability in the sense of Hyers-Ulam; subquadratic functions; Jensen equation and inequality; Wright convexity; Hosszú equation; Cauchy equation; separation theorems; alienation
References
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Instytut Matematyki, Uniwersytet Śląski w Katowicach Poland
https://orcid.org/0000-0003-1194-1327
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