Stefan Kempisty (1892–1940)
Available online at www.sciencedirect.com ScienceDirect Historia Mathematica 48 (2019) 69–86 www.elsevier.com/locate/yhmat Stefan Kempisty (1892–1940) a b a,c, Izabela Jó´zwik , Lech Maligranda , Małgorzata Terepeta ∗ a Center of Mathematics and Physics, Lodz University of Technology, al. Politechniki 11, 90-924 Łód´z, Poland b Department of Engineering Sciences and Mathematics, Luleå University of Technology, SE-971 87 Luleå, Sweden c Institute of Mathematics, Lodz University of Technology, ul. Wólcza´nska 215, 90-924 Łód´z, Poland Available online 21 February 2019 Abstract Stefan Kempisty was a Polish mathematician, working on the theory of real functions, set theory, integrals, interval functions and the theory of surface area. In 1919 he defended his Ph.D. thesis, On semi-continuous functions, at the Jagiellonian University in Cracow under the supervision of Kazimierz Zorawski.˙ In December 1924 he did his habilitation at the University of Warsaw and continued his work at the Stefan Batory University in Vilnius. Kempisty published over forty scientific papers, three textbooks and one monograph. Kempisty’s name in mathematics appears in connection with the definition of quasi-continuous functions, different kinds of continuity of functions of several variables, the classification of Baire, Young and Sierpinski´ functions, interval functions, and Denjoy or Burkill integrals. This paper is prepared for a wide range of readers. It is an abridged version of the article written in Polish by the same authors (cf. Jó´zwik et al., 2017), where can be found more detailed information. © 2019 Elsevier Inc. All rights reserved. Streszczenie Stefan Kempisty był polskim matematykiem zajmuj ˛acym si˛e funkcjami zmiennej rzeczywistej, teoria ˛ mnogosci,´ całkami, funkc- jami przedziału i teoria ˛ pola powierzchni.
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