Docs: std.math.conj wrong

[Daniel Keep]

The documentation for std.math.conj states:

 `` Note that z * conj(z) = z.re^2 - z.im^2 is always a real number ''

This *should* say:

 `` Note that z * conj(z) = z.re^2 + z.im^2 is always a real number ''

Proof:

given
        z = x + iy
  conj(z) = x - iy

then
z*conj(z) = (x + iy)(x - iy)
          = x^2 - ixy + ixy - (i^2 y^2)  -- Two ixy's cancel out
          = x^2 - ((-1)y^2)  -- i^2 = (-1)
          = x^2 - (-y^2)
          = x^2 + y^2
            QED

As far as I can tell, this is purely a documentation issue, not a code one.

	-- Daniel

-- 
int getRandomNumber()
{
    return 4; // chosen by fair dice roll.
              // guaranteed to be random.
}

http://xkcd.com/

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