Mathematician:Joseph-Émile Barbier

Mathematician
French astronomer and mathematician, best known for Barbier's Theorem on the perimeter of curves of constant width.

Nationality
French

History

 * Born: 18 March 1839 in St Hilaire-Cottes, Pas-de-Calais, France
 * Died: 28 January 1889 in St Genest, Loire, France

Theorems and Definitions

 * Barbier's Theorem