Method __sub__

recipes/Python/580610_Auto_differentiation/recipe-580610.py:77–78

(u, v)

        return Num(float(u) + float(v), d(u) + d(v))

    def __sub__(u, v):
        return Num(float(u) - float(v), d(u) - d(v))

    def __mul__(u, v):
        u, v, du, dv = float(u), float(v), d(u), d(v)