Kdo je hodil z Pavel Urysohn?

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 to the theory of topological dimension, and for developing Urysohn's metrization theorem and Urysohn's lemma, both of which are fundamental results in topology. He also constructed what is now called the Urysohn universal space and his name is also commemorated in the terms Fréchet–Urysohn space, Menger–Urysohn dimension and Urysohn integral equation. He and Pavel Alexandrov formulated the modern definition of compactness in 1923.

Pavel Sergejevič Aleksandrov (rusko Па́вел Серге́евич Алекса́ндров), ruski matematik, * 7. maj 1896, Bogorodsk, Ruski imperij (sedaj Noginsk, Rusija), † 16. november 1982, Moskva, Sovjetska zveza (sedaj Rusija).

Aleksandrov je bil učenec Jegorova. Napisal je približno 300 člankov in pomembno prispeval k teoriji množic in topologiji. Leta 1953 je postal član Sovjetske akademije znanosti.

Njegovi učenci so bili Kuroš, Pontrjagin in Tihonov