Topic summary
Argand diagram
Extracted from the Wikipedia article Complex plane.
Argand diagram
An Argand diagram is a geometric plot of complex numbers as points z = x + iy using the horizontal x-axis as the real axis and the vertical y-axis as the imaginary axis. Though named after Jean-Robert Argand (1768–1822), such plots were first described by Norwegian–Danish land surveyor and mathematician Caspar Wessel (1745–1818). Argand diagrams are frequently used to plot the positions of the zeros and poles of a function in the complex plane.