Ar·gand diagram | \ ˌär-ˈgän- 
, -ˈgan- \
, -ˈgan- \Definition of Argand diagram
: a system of rectangular coordinates in which the complex number x + iy is represented by the point whose coordinates are x and y
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Time Traveler for Argand diagram
The first known use of Argand diagram was in 1889
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