It is natural to associate the complex number
z = x + iy
with a point in the plane whose rectangular coordinates
are x and y.
Each complex number corresponds to just one point, and conversely. The number
z
can also be thought of as the vector from the origin to the point
(x, y).
When used for the purpose of displaying the numbers
z = x + iy
geometrically, the xy-plane is called the complex plane, or the z- plane. The x axis is called
the real axis, and the y axis is known as the imaginary axis.
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