# Mathematician:Jean-Robert Argand

## Mathematician

Amateur mathematician of Swiss origin, also an accountant and bookseller, best known for the Argand diagram.

Also published, in $1814$, the first complete and rigorous proof of the Fundamental Theorem of Algebra.

Swiss

## History

• Born: 18 July 1768, Geneva, Switzerland
• Died: 13 Aug 1822, Paris, France

## Theorems and Definitions

Definitions of concepts named for Jean-Robert Argand can be found here.

## Publications

• 1814: Réflexions sur la nouvelle théorie d'analyse (Reflections on the new theory of analysis)