Nikolai Ivanovich Lobachevsky

Nikolai Ivanovich Lobachevsky (Никола́й Ива́нович Лобаче́вский) (December 1, 1792 - February 24, 1856, N.S.; November 20, 1792 - February 12, 1856, O.S.) was a Russian mathematician.

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• There is no branch of mathematics, however abstract, which may not some day be applied to phenomena of the real world.