Who was born first, Nikolai Chebotaryov or  Leonid Khachiyan?
Nikolai Chebotaryov Nikolai Grigorievich Chebotaryov (often spelled Chebotarov or Chebotarev, Russian: Никола́й Григо́рьевич Чеботарёв , Ukrainian: Микола Григорович Чоботарьов ) (15 June [O.S. 3 June] 1894 – 2 July 1947) was a noted Ukrainian and Soviet mathematician. He is best known for the Chebotaryov density theorem.
Nikolai Chernykh Nikolai Stepanovich Chernykh (Russian: Николай Степанович Черных ) (6 October 1931 – 26 May 2004) was a Russian-born Soviet astronomer and discoverer of minor planets and comets at the Crimean Astrophysical Observatory in Nauchnij, on the Crimean peninsula.