# Mathematician:Nikolai Ivanovich Lobachevsky

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## Contents

## 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 Tom Lehrer.

## 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 Carl Friedrich Gauss and János Bolyai)
- Lobachevsky Integral Formula

Results named for **Nikolai Ivanovich Lobachevsky** can be found here.

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

## Sources

- John J. O'Connor and Edmund F. Robertson: "Nikolai Ivanovich Lobachevsky": MacTutor History of Mathematics archive

- 1937: Eric Temple Bell:
*Men of Mathematics*: Chapter $\text{XVI}$ - 2008: David Nelson:
*The Penguin Dictionary of Mathematics*(4th ed.) ... (previous) ... (next): Entry:**Lobachevsky, Nikolai Ivanovich**(1793-1856)

*but note the erroneous birth year*

- 2014: Christopher Clapham and James Nicholson:
*The Concise Oxford Dictionary of Mathematics*(5th ed.) ... (previous) ... (next): Entry:**Lobachevsky, Nikolai Ivanovich**(1792-1856)