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Argand diagram

noun, Mathematics.
a Cartesian coordinate system consisting of two perpendicular axes for graphing complex numbers, the real part of a number being plotted along the horizontal axis and the imaginary part along the vertical axis.
Origin of Argand diagram
1905-10; named after Jean-Robert Argand (1768-1822), Swiss mathematician Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for argand-diagram

Argand diagram

(maths) a diagram in which complex numbers are represented by the points in the plane the coordinates of which are respectively the real and imaginary parts of the number, so that the number x + iy is represented by the point (x, y), or by the corresponding vector <x, y>. If the polar coordinates of (x, y) are (r, θ), r is the modulus and θ the argument of x + iy See also amplitude (sense 5)
Word Origin
C19: named after Jean-Robert Argand (1768–1822), French mathematician
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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