Czesław Ryll-Nardzewski

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Czesław Ryll-Nardzewski
Born (1926-10-07) October 7, 1926 (age 88)
Wilno, Commonwealth of Poland
Nationality Poland
Fields Mathematics
Institutions Wrocław University of Technology
Warsaw University
Doctoral advisor Mieczysław Biernacki
Doctoral students Anzelm Iwanik
Kazimierz Musiał
Leszek Pacholski
Rastislav Telgarsky

Czesław Ryll-Nardzewski (Polish: [ˈt͡ʂɛswav ˈrɨl narˈd͡zɛfskʲi]; born October 7, 1926) is a Polish mathematician.

He was a student of Hugo Steinhaus. At the age of 26 he became professor at the Warsaw University and in 1959 at the Wrocław University of Technology. His main research areas are measure theory, functional analysis, foundations of mathematics and probability theory. Several theorems bear his name: the Ryll-Nardzewski fixed point theorem, the Ryll-Nardzewski theorem in model theory, and the Kuratowski–Ryll-Nardzewski measurable selection theorem.

He is a member of the Polish Academy of Sciences since 1967.