Ján Borsík (1955 -- 2019)

Abstract

Professor  J\'{a}n Bors\'{i}k passed away in Ko\v{s}ice, Slovakia, on Friday, September 6, 2019. The sad news reached the participants of 33rd International Summer Conference on Real Functions held in Ustka, Poland, only three days later. True, J\'{a}n  struggled with cancer over a longer period, but was still an active member of the "real functions community". Exactly one year ago he headed/managed the 32nd ISCRF in Star\'{a} Lesn\'{a} and served as an editor of the present issue of Tatra Mountains Mathematical Publications. True, the treacherous illness severely limited his life and he has stepped down from his teaching duties and editorial responsibilities in last months. Even though the participants of 33rd ISCRF could not participate in his funeral, they expressed their deep sorrow and during the conference commemorated Professor J\'{a}n Bors\'{i}k, his personal and research qualities, friendship and services to the conferrence. It is only natural to devote the present issue of TMMP to his memory.