Nikolai Ivanovich Lobachevsky, n.
Russian mathematician who independently discovered non-Euclidean geometry (1792-1856)
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Lobachevsky Nikolai Ivanovich Lobachevsky
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Russian mathematician who independently discovered non-Euclidean geometry (1792-1856)
<noun.person>
Lobachevsky Nikolai Ivanovich Lobachevsky