Pavel Sergeyevich Alexandrov (Russian: Па́вел Серге́евич Алекса́ндров), sometimes romanized Aleksandroff or Aleksandrov (7 May 1896 – 16 November 1982), was a Soviet Russian mathematician. He wrote about three hundred papers, making important contributions to set theory and topology.In topology, the Alexandroff compactification and the Alexandrov topology are named after him.Alexandrov attended Moscow State University where he was a student of Dmitri Egorov and Nikolai Luzin.