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Jean Robert Argand (1768 - 1822) was an accountant and bookkeeper in Paris who was only an amateur mathematician.

[[[> IMG:1156_Argand-Jean-Robert.jpg ]]]

Jean-Robert Argand (1768 - 1822) was an accountant and bookkeeper in Paris who was only an amateur mathematician.

Argand is famed for his geometrical interpretation of the complex numbers where

multiplication by /i/ is interpreted as an anti-clocakwise rotation

multiplication by /i/ is interpreted as an anti-clockwise rotation

through 90°. The concept of the modulus of a complex number is also due to Argand but Cauchy, who used the term

later, is usually credited as the originator this concept. The Argand diagram is taught to most school children

who are studying mathematics and Argand's name will live on in the history of mathematics through this important

concept.

later, is usually credited as the originator this concept.

The fact that his name is associated with this geometrical interpretation of complex numbers is only as a result

of a rather strange sequence of events.

For more, read on ...

* http://www-groups.dcs.st-and.ac.uk/~history/Biographies/Argand.html

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