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174 bytes added ,  15:45, December 29, 2006
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: <math>i = \sqrt{-1}</math>
 
: <math>i = \sqrt{-1}</math>
   −
From this definition a "complex plane" is constructed, consisting of z = x + iy, where x and y are real numbers.
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From this definition a "complex plane" is constructed, consisting of z = x + iy, where x and y are real numbers:
 +
 
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: <math>z = x + iy\,</math>, and
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: <math>w = f(z) = u(z) + iv(z)\,</math>
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: where <math>x,y \in \mathbb{R}\,</math> and <math>u(z), v(z)\,</math> are real-valued functions.
    
so that real numbers are on the x-axis and imaginary numbers are on the y-axis.
 
so that real numbers are on the x-axis and imaginary numbers are on the y-axis.
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