Were Pavel Urysohn and Leonid Levin known for the same type of work?
Pavel Urysohn Pavel Samuilovich Urysohn (Па́вел Самуи́лович Урысо́н ) (February 3, 1898 – August 17, 1924) was a Soviet mathematician of Jewish origin 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.
Lebedev Physical Institute The Lebedev Physical Institute of the Russian Academy of Sciences (LPI RAS) (in Russian: Физи́ческий институ́т имени П.Н.Ле́бедева Российской академии наук (ФИАН) ), situated in Moscow, is one of the leading Russian research institutes specializing in physics. It is also one of the oldest research institutions in Russia: its history dates back to a collection of physics equipment established by Peter the Great in the Kunstkamera of Saint Petersburg in 1714. The institute was established in its present shape in 1934 by academician Sergey Vavilov. It moved to Moscow and was named after a prominent Russian physicist Pyotr Lebedev the same year. It is also known as Lebedev Institute of Physics or just Lebedev Institute. In Russian it is often referred to by the acronym FIAN (ФИАН) standing for "Physical Institute of the Academy of Sciences".