Nikolai Ivanovich Lobachevsky
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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.
- As quoted in George Edward Martin, The Foundations of Geometry and the Non-Euclidean Plane, Springer (1998 ), p. 225; also in Stanley Gudder, A Mathematical Journey, McGraw-Hill (1976), p. 36.