Question: Were Pavel Alexandrov and Valentin Turchin were both what?
Sentence (from "Pavel Alexandrov"): Pavel Sergeyevich Alexandrov (Russian: Па́вел Серге́евич Алекса́ндров ), sometimes romanized Paul Alexandroff or Aleksandrov (7 May 1896 – 16 November 1982), was a Soviet mathematician.
Relevant evidence: Yes