Lobachevsky
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Lobachevsky
(1792 - 1856) investigated
Non-Euclidean geometry
and showed that
Euclid
's 5th postulate is independent of the other four.
See also:
http://en.wikipedia.org/wiki/Nikolai_Lobachevsky
http://www.gap-system.org/~history/Mathematicians/Lobachevsky.html
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