**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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## SourcedEdit

- There is no branch of mathematics, however abstract, which may not some day be applied to phenomena of the real world.
- As quoted in George Edward Martin,
*The Foundations of Geometry and the Non-Euclidean Plane*, Springer (1998 [1975]), p. 225; also in Stanley Gudder,*A Mathematical Journey*, McGraw-Hill (1976), p. 36

- As quoted in George Edward Martin,