Mathematician:Nikolai Ivanovich Lobachevsky

Mathematician
Known as "the Copernicus of geometry", for his development of a non-Euclidean geometry, that is, one which does not use the parallel postulate. Subject of a song by.

Nationality
Russian

History

 * Born: 1 December 1792 in Nizhny Novgorod (was Gorky from 1932-1990), Russia
 * Died: 24 February 1856 in Kazan, Russia

Theorems and Conjectures

 * Gauss-Bolyai-Lobachevsky Space (with and )
 * Lobachevsky Integral Formula

Publications

 * 1823: Geometriya (although not published its exact original form till 1909)
 * 1829: A concise outline of the foundations of geometry
 * 1832: On the most important subjects of education
 * 1837: Géométrie imaginaire
 * 1840: Geometrische Untersuchungen zur Theorie der Parellellinien

Also known as
Full name in Russian: Никола́й Ива́нович Лобаче́вский.

His name is variously rendered in Roman script; for example, in his  writes it as Lobatchewsky.