The Real part reference article from the English Wikipedia on 24-Jul-2004
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Real part

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A real part is the first element of the ordered pair of real numbers representing a complex number, i.e. if , then the real part is x and notated Rez or .

In terms of the complex conjugate it is . It is not holomorphic.

The real part of the complex number returned by a complex function.

If a complex number is of the form , then the imaginary part is .