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[[Image:Obachevsky.jpg|right|thumb]]
[[Image:Obachevsky.jpg|right|thumb]]
'''Nikolai I. Lobachevsky''' (1792-1856) was a [[Russian]] [[mathematics|mathematician]].
'''Nikolai I. Lobachevsky''' (1792-1856) was a [[Russia]]n [[mathematics|mathematician]].
He developed [[non-Euclidean geometry]] independently of his rival the [[Hungarian]] mathematician [[Janos Bolyai]], who developed the same concept at the same time. Non-Euclidean geometry is a system of geometry that rejects traditional Euclidean geometry's fifth postulate that parallel lines can never intersect. He also invented a method for finding the approximations of the roots of algebraic equations.
He developed [[non-Euclidean geometry]] independently of his rival the [[Hungarian]] mathematician [[Janos Bolyai]], who developed the same concept at the same time. Non-Euclidean geometry is a system of geometry that rejects traditional Euclidean geometry's fifth postulate that parallel lines can never intersect. He also invented a method for finding the approximations of the roots of algebraic equations.