Nikolai Ivanovich Lobachevsky (1792 - 1856); Russian mathematician and geometer, known primarily for his work on hyperbolic geometry, otherwise known as Lobachevskian geometry and also his fundamental study on Dirichlet integrals known as Lobachevsky integral formula.

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Keywords: dirichlet, formula, fundamental, geometer, geometry, hyperbolic, integral, integrals, ivanovich, lobachevskian, lobachevsky, mathematician, medicine, nikolai, russia, russian, study, tsarist, work