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Czesław Ryll-Nardzewski

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Czesław Ryll-Nardzewski
Born(1926-10-07)7 October 1926
Wilno, Second Polish Republic
Died 18 September 2015(2015-09-18) (aged 88)
Wrocław,[2] Poland
NationalityPolish
Known forRyll-Nardzewski fixed point theorem
Ryll-Nardzewski theorem
Kuratowski and Ryll-Nardzewski measurable selection theorem
Scientific career
FieldsMathematics
InstitutionsWrocław University of Technology
Warsaw University
Doctoral advisorMieczysław Biernacki[1]

Czesław Ryll-Nardzewski (Polish: [ˈt͡ʂɛswaf ˈrɨl narˈd͡zɛfskʲi]; 7 October 1926 – 18 September 2015) was a Polish mathematician.

Life and career

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Born in Wilno, Second Polish Republic (now Vilnius, Lithuania), he was a student of Hugo Steinhaus. At the age of 26 he became professor at Warsaw University. In 1959, he became a professor at the Wrocław University of Technology. He was the advisor of 18 PhD theses.[1] His main research areas were measure theory, functional analysis, foundations of mathematics and probability theory. Several theorems bear his name: the Ryll-Nardzewski fixed point theorem,[3] the Ryll-Nardzewski theorem[4][5] in model theory, and the Kuratowski and Ryll-Nardzewski measurable selection theorem.[6][7][8]

He became a member of the Polish Academy of Sciences in 1967.[2] He died in 2015 at the age of 88[2][9] and he is buried in Wrocław at Grabiszyński Cemetery [pl].[10]

References

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  1. ^ a b "Mathematics Genealogy Project". Retrieved 9 February 2021.
  2. ^ a b c Zmarł Profesor Czesław Ryll-Nardzewski (in Polish)
  3. ^ Granas, Andrzej; Dugundji, James (2003). Fixed point theory. Springer Monographs in Mathematics. New York: Springer Verlag. pp. 171, 172, 174, 196. doi:10.1007/978-0-387-21593-8. ISBN 0-387-00173-5. MR 1987179. “9. Theorem of Ryll-Nardzewski” (p. 171), “(9.6) Theorem (Ryll-Nardzewski)” (p. 174)
  4. ^ Hodges, Wilfrid (1993). "7.3 Countable categoricity". Model theory. Encyclopedia of Mathematics and its Applications. Vol. 42. Cambridge: Cambridge University Press. p. 341. doi:10.1017/CBO9780511551574. ISBN 978-0-521-30442-9. MR 1221741. See Theorem 7.3.1
  5. ^ Cameron, Peter J. (1990). "2.5 The Ryll-Nardzewski Theorem". Oligomorphic permutation groups. London Mathematical Society Lecture Note Series. Vol. 152. Cambridge: Cambridge University Press. p. 30. doi:10.1017/CBO9780511549809. ISBN 0-521-38836-8. MR 1066691. Zbl 0813.20002. Cf. (2.10)
  6. ^ Bogachev, Vladimir I. (2007). Measure theory. Vol. II. Berlin: Springer Verlag. pp. 36, 441. doi:10.1007/978-3-540-34514-5. ISBN 978-3-540-34513-8. MR 2267655. See Theorem 6.9.3 on p. 36 and the historical comment on p. 441
  7. ^ Kechris, Alexander S. (1995). "II. Borel Sets". Classical descriptive set theory. Graduate Texts in Mathematics. Vol. 156. New York: Springer Verlag. p. 76. doi:10.1007/978-1-4612-4190-4. ISBN 0-387-94374-9. MR 1321597. See Theorem (12.13) at the bottom of p. 76
  8. ^ Cascales, Bernardo; Kadets, Vladimir; Rodríguez, José (2010). "Measurability and selections of multi-functions in Banach spaces". Journal of Convex Analysis. 17 (1): 229–230. MR 2642727. See Theorem A
  9. ^ Michał, Morayne (2016). "Czesław Ryll-Nardzewski (1926-2015)". Wiadomości Matematyczne. Series II. 52 (1): 163–165. doi:10.14708/wm.v52i1.3385. MR 3559446.
  10. ^ "Grave record for Czesław Ryll-Nardzewski (7 Oct 1926 - 18 Sep 2015), BillionGraves Record 25205206 Wrocław, wrocławski, dolnośląskie, Poland".


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