Mathematician:Caspar Wessel

Mathematician
Norwegian–Danish mathematician and cartographer who, in $1799$, was the first person to describe the geometrical interpretation of complex numbers as points in the complex plane. The younger brother of poet and playwright.

Nationality
Norwegian

History

 * Born: 8 June 1745 in Vestby (near Dröbak), Norway
 * Died: 25 March 1818 in Copenhagen, Denmark

Theorems and Definitions

 * The actual originator of what is now known as the Argand diagram.

Publications

 * 1797: Om Directionens Analytiske Betegning ("On the Analytical Representation of Direction")