Isidor Natanson
Isidor Pavlovich Natanson (; February 8, 1906 in Zurich – July 3, 1964 in Leningrad) was a Swiss-born Soviet mathematician known for contributions to real analysis and constructive function theory, in particular, for his textbooks on these subjects. His son, Garal'd Natanson (1930–2003), was also a known mathematician. Selected publications

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Mathematical analysts
Approximation theorists
1906 births
1964 deaths
Soviet mathematicians
20th-century Russian mathematicians
Immigrants to the Soviet Union
Swiss emigrants