Mathematician:Nikolai Ivanovich Lobachevsky

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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 Tom Lehrer.




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

Theorems and Conjectures

Results named for Nikolai Ivanovich Lobachevsky can be found here.

Definitions of concepts named for Nikolai Ivanovich Lobachevsky can be found here.


  • 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, Eric Temple Bell in his Men of Mathematics writes it as Lobatchewsky.


but note the erroneous birth year