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[[Image:Obachevsky.jpg|right|thumb]]
'''Nikolai I. Lobachevsky''' (1792-1856) was a Russian mathematician.
'''Nikolai I. Lobachevsky''' (1792-1856) was a Russian mathematician.
He invented non-Euclidean geometry, 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 was one of the pioneers of non-Euclidean geometry, 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.
[[Category: Mathematicians|Lobachevsky, Nikolai I]]
[[Category: Mathematicians|Lobachevsky, Nikolai I]]