Which mathematician was born first, Pyotr Novikov or Dmitri Egorov?
Pyotr Novikov Pyotr Sergeyevich Novikov (Russian: Пётр Серге́евич Но́виков ; 15 August 1901, Moscow, Russian Empire – 9 January 1975, Moscow, Soviet Union) was a Soviet mathematician.
Sergei Sobolev Sergei Lvovich Sobolev (Russian: Серге́й Льво́вич Со́болев ; 6 October 1908 – 3 January 1989) was a Soviet mathematician working in mathematical analysis and partial differential equations. He was born in St. Petersburg, and died in Moscow.