Updates:
Status: Fixed
Comment #4 on issue 2664 by [email protected]: sign(x) should reduce to
x/abs(x) when x is known to not be 0
http://code.google.com/p/sympy/issues/detail?id=2664
Now,
conjugate(x).diff(x)
Derivative(conjugate(x), x)
sign(1 + I)
sign(1 + I)
_.doit()
sqrt(2)*(1 + I)/2
sign(x)
sign(x)
_.doit()
sign(x)
var('x', nonzero=True)
x
sign(x).doit()
x/Abs(x)
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