Were Pavel Urysohn and Leonid Levin known for the same type of work?
Leonid Levin Leonid Anatolievich Levin ( ; Russian: Леони́д Анато́льевич Ле́вин ; Ukrainian: Леоні́д Анато́лійович Ле́він ; born November 2, 1948) is a Soviet-American computer scientist.
Leonid Kurchevsky Leonid Vasilyevich Kurchevsky (Russian: Леонид Васильевич Курчевский ) (September 22, 1890, Pereslavl-Zalessky – November 26, 1937 (January 12, 1939?)) was a Russian/Soviet weapons designer.