Nikolai Ivanovich Lobachevsky

✶December 1, 1792

†February 24, 1856

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About their life

Nikolai Ivanovich Lobachevsky was a Russian mathematician and geometer, known primarily for his work on hyperbolic geometry, otherwise known as Lobachevskian geometry, and also for his fundamental study on Dirichlet integrals, known as the Lobachevsky integral formula.

Russian mathematician (1792–1856)

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Biography from the article Nikolai Ivanovich Lobachevsky on the English Wikipedia, available under CC BY-SA 4.0.