János Aczél (mathematician) is confirmed dead at the age of 95.
János was best known as a Hungarian-Canadian mathematician.
János Aczél
János Aczél mathematician 1970.jpg
Aczél in 1970
János Dezső Aczél

(1924-12-26)26 December 1924
Budapest, Hungary
Died1 January 2020(2020-01-01) (aged 95)
Ontario, Canada
NationalityFlag of Hungary.svg Hungarian
Flag of Canada.svg Canadian
Spouse(s)Zsuzsanna Kende
ChildrenKatalin (Catherine)
Júlia (Julie)
Scientific career
Fieldsfunctional equations
information theory
InstitutionsUniversity of Waterloo
University of Cologne
University of Debrecen
University of Miskolc
University of Szeged
InfluencesFrigyes Riesz
Lipót Fejér
János Dezső Aczél FRSC (Hungarian: ; 26 December 1924 – 1 January 2020), also known as John Aczel, was a Hungarian-Canadian mathematician, who specialized in functional equations and information theory.
1 Professional career
2 Awards and honors
3 Books
4 References
5 External links
Professional career
Aczél earned a doctorate in mathematical analysis from the University of Budapest, and held positions at the University of Cologne, Kossuth University, University of Miskolc, and University of Szeged. He joined the University of Waterloo faculty in 1965, eventually becoming Distinguished Professor in the Department of Pure Mathematics.
He was the founder of the journal Aequationes Mathematicae, first published in 1968, and remained its honorary editor-in-chief.
Awards and honors
Aczél held honorary degrees from the University of Karlsruhe, the University of Graz, and the University of Silesia in Katowice.
In 1971, he was elected a fellow of the Royal Society of Canada. In 1990 he became an external member of the Hungarian Academy of Sciences. In 2008 he became an honorary member of the Hamburg Mathematical Society, the oldest active mathematical society in the world.
He was the 1988 winner of the Santiago Ramón y Cajal Medal. In 2004 he won the Kampé de Fériet Award of the annual Information Processing and Management of Uncertainty conference, "for his pioneering work on the theory of functional equations, with applications in many fields, such as information measures, index numbers, group decision making, aggregation, production functions, laws of science, theory of measurement and utility theory."
Issues of the journal Aequationes Mathematicae were dedicated to Aczél in 1999, 2005, and 2010, in honor of his 75th, 80th, and 85th birthdays.
Aczél was the author or co-author of:
Aczél, J. (1966), Lectures on functional equations and their applications, Mathematics in Science and Engineering, 19, New York: Academic Press, MR 0208210. Previously published in German as Vorlesungen über Funktionalgleichungen und ihre Anwendungen (Birkhäuser, 1961).
Aczél, J.; Daróczy, Z. (1975), On measures of information and their characterizations, Mathematics in Science and Engineering, 115, New York: Academic Press , MR 0689178.
Aczél, J. (1987), A short course on functional equations, Theory and Decision Library. Series B: Mathematical and Statistical Methods, Dordrecht: D. Reidel Publishing Co., doi:10.1007/978-94-009-3749-9, ISBN 90-277-2376-1.
Aczél, J.; Dhombres, J. (1989), Functional equations in several variables, Encyclopedia of Mathematics and its Applications, 31, Cambridge: Cambridge University Press, doi:10.1017/CBO9781139086578, ISBN 0-521-35276-2.
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