<history of philosophy, biography> Russian mathematician who developed a non-Euclidean geometry (1792-1856), denying the truth of Euclid's parallel postulate by supposing that there may be two or more such lines passing through a given point. Recommended Reading: H. S. Coxeter, Non-Euclidean Geometry (Math. Assn. of Amer., 1998); Marvin Jay Greenberg, Euclidean and Non-Euclidean Geometries: Development and History (Freeman, 1995); Non-Euclidean Geometry, ed. by Roberto Bonola and H. S. Carslaw (Dover, 1954); and Morris Kline, Mathematical Thought from Ancient to Modern Times (Oxford, 1990).
[A Dictionary of Philosophical Terms and Names]
Try this search on OneLook / Google