Talk:Complex number

In the discussion of the argument of a complex number, I removed the following:

Note that this is exactly the same problem encountered when trying to define the inverse tangent as a function. The connection becomes more transparent when one considers that the formula for calculating arg(z) is arg(z) = arctan(b/a) if z = a + i b.

The values of the arctan function lie between -Pi/2 and +Pi/2, while arguments of complex numbers lie between -Pi and +Pi. The arctan formula for arg(z) is therefore incorrect. Most programming language have a function atan2(b, a) which returns the proper argument of a + i b by taking the signs of a and b into account. --AxelBoldt

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You can see the translation to spanisn in http://es.wikipedia.com/wiki.cgi?Números_Complejos --Atlante

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A graphical explanation is better than words. Should add images sometime. --Wshun