Mathematician:Charles-Ange Laisant

Mathematician

French politician and mathematician who published some books and founded some journals.

Determined the number of digits in $9^{9^9}$.

Nationality

French

History

• Born: 1 November 1841 in Indre, France
• Died: 5 May 1920

Theorems and Definitions

• Largest Integer Expressible by $3$ Digits: Number of Digits

Publications

• 1881: Introduction à la Méthode des Quaternions
• 1887: Théorie et applications des equipollences

• 1894: Founded L'Intermédiaire des Mathématiciens (with Émile Michel Hyacinthe Lemoine)
• 1899: Founded L'Enseignement Mathématique (with Henri Fehr)