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.

Nationality
Swiss

History

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

Theorems and Definitions

 * Argand Diagram
 * Argand Plane (also known as Gaussian Plane or Gauss Plane for ), another name for the Complex Plane

Publications

 * 1806:




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