I run the following code in ipython3 notebook:
import sympy
x=sympy.symbols("x",real=True)
f=sympy.symbols("f",cls=sympy.Function,real=True)
sympy.Abs(f(x)).diff(x)
and expect that the answer is just df(x)/dx. However, sympy still treat the
function f is a complex function.
So how to tell sympy that f is a real function?
Chaowen GUO
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