Ján Borsík (1955 – 2019)

Abstract

The sad news reached the participants of the 33rd International Summer Conference on Real Functions held in Ustka, Poland, only three days later. True, Ján struggled with cancer over a longer period, however, was still an active member of the "real functions community". Exactly one year ago, he headed/managed the 32nd ISCRF in Stará Lesná and served as an editor of the present issue of Tatra Mountains Mathematical Publications. True, the treacherous illness severely limited his life and he had to step down from his teaching duties and editorial responsibilities in last months. Even though the participants of the 33rd ISCRF could not participate in his funeral, they expressed their deep sorrow, and during the conference commemorated Professor Ján Borsík, 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. Ján Borsík was born on 11. 9. 1955 in Trstené, Slovakia. After completing his secondary education, in the period 1975-1980 he studied at the School of Natural Sciences, Comenius University in Bratislava, Slovakia. Already as a student, he participated in a scientific seminar devoted to real functions led by Professor TiborŠalát and remained faithful to real functions all his life. After his graduation, Janko Borsík obtained his RNDr. title in 1981 and, under the supervision of ProfessorŠalát, the scientific degree CSc. (equivalent to PhD). Finally, based on his Habilitationshrift, in 1999 he was promoted to Docent in Mathematics. Since 1980 until his premature death, he was affiliated with the Mathematical Institute of Slovak Academy of Sciences, Extension in Košice, as a Senior Scientific Fellow. For a long time Professor Ján Borsík lectured at theŠafárik University and the Technical University in Košice and at the Prešov University in Prešov, where his colleagues and students appreciated his scientific and pedagogical masterships very much. The same can be said about several PhD students and members of the broader Slovak mathematical community.