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 Carl Friedrich Gauss), another name for the Complex Plane

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

Publications

• 1806: Essai sur une manière de représenter les quantités imaginaires dans les constructions géométriques

• 1813: Essai sur une manière de représenter les quantités imaginaires dans les constructions géométriques (Annales de mathématiques pures et appliquées Vol. 4: pp. 133 – 147)

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

Sources

• John J. O'Connor and Edmund F. Robertson: "Jean-Robert Argand": MacTutor History of Mathematics archive

• 1986: David Wells: Curious and Interesting Numbers ... (previous) ... (next): A List of Mathematicians in Chronological Sequence
• 1997: David Wells: Curious and Interesting Numbers (2nd ed.) ... (previous) ... (next): A List of Mathematicians in Chronological Sequence
• 1998: David Nelson: The Penguin Dictionary of Mathematics (2nd ed.) ... (previous) ... (next): Argand diagram (complex plane)
• 2008: David Nelson: The Penguin Dictionary of Mathematics (4th ed.) ... (previous) ... (next): Argand diagram (complex plane)
• 2014: Christopher Clapham and James Nicholson: The Concise Oxford Dictionary of Mathematics (5th ed.) ... (previous) ... (next): Argand, Jean Robert (1768-1822)
• 2021: Richard Earl and James Nicholson: The Concise Oxford Dictionary of Mathematics (6th ed.) ... (previous) ... (next): Argand, Jean Robert (1768-1822)