# Mathematician:Caspar Wessel

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## 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 Johan Herman Wessel.

## 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")

## Sources

- 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