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Aleksandr Ivanovic Nekrasov (December 9, 1883 – May 21, 1957) was a Russian mathematician known for his mathematical contributions to hydromechanics and aeromechanics.

Nekrasov was born in Moscow, Russia, where he would remain for the rest of his life. He went to school and graduated from the University of Moscow in 1906. Nekrasov graduated with a first class diploma.

Nekrasov earned a gold medal for work of his essay, Theory of the Satellites of Jupiter.