Pavel Urysohn

Pavel Urysohn
Urysohn c. 1918-20
Born	Pavel Samuilovich Urysohn 3 February 1898 Odesa, Russian Empire
Died	17 August 1924(1924-08-17) (aged 26) Batz-sur-Mer, Pays de la Loire, France
Alma mater	Moscow State University (BS, PhD)
Years active	1915-1924
Known for	Urysohn's lemma Urysohn's metrization theorem Fréchet–Urysohn space Menger–Urysohn dimension Urysohn universal space Current definition of compactness

Pavel Samuilovich Urysohn (in Russian: Па́вел Самуи́лович Урысо́н; 3 February, 1898 – 17 August, 1924) was a Soviet mathematician who is best known for his contributions in dimension theory, and for developing Urysohn's metrization theorem and Urysohn's lemma, both of which are fundamental results in topology. His name is also commemorated in the terms Urysohn universal space, Fréchet–Urysohn space, Menger–Urysohn dimension and Urysohn integral equation. He and Pavel Alexandrov formulated the modern definition of compactness in 1923.