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- Mathematician Czesław Ryll - Nardzewski, 1926
- Mathematician Chen Chung Chang, 1920+
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Czesław Ryll-Nardzewski (October 7, 1926 - September 18, 2015) was 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 were 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 was a member of the Polish Academy of Sciences since 1967. He died
in 2015 at the age of 88 and he is buried in Wrocław, at Grabiszyński
cemetery.
Chen Chung Chang (1927 - July 17, 2014) was a mathematician who worked in model theory. He obtained his PhD from Berkeley in 1955 on "Cardinal and Ordinal Factorization of Relation Types" under Alfred Tarski. He wrote the standard text Chang & Keisler (1990) on model theory. Chang's conjecture is named after him. He also proved the ordinal partition theorem (expressed in the arrow notation for Ramsey theory) ωω→(ωω,3)2, originally a problem of Erdős and Hajnal. He was emeritus professor at the mathematics department of the UCLA.