a732984b582e2869665c6448d35cad2c4178ad94,sympy/concrete/products.py,Product,_eval_derivative,#Product#Any#,402

Before Change

        limits = list(self.limits)
        if any(x in limit[1:].free_symbols for limit in reversed(limits)):
            return None
        return self * Sum(self.function.diff(x) / self.function, self._args[1:], **self.assumptions0)

    def is_convergent(self):
        r
        See docs of :obj:`.Sum.is_convergent()` for explanation of convergence

After Change

            return S.Zero
        from sympy.concrete.summations import Sum, Dummy
        i = Dummy("i")
        f = self.function
        limits = list(self.limits)
        _, a, b = limits[0]
        if any(x in limit[1:].free_symbols for limit in limits):
            return None
        return Sum(f.subs(_, i).diff(x) * Product(f, (_, a, i - 1)) * Product(f, (_, i + 1, b)), (i, a, b), **self.assumptions0)

    def is_convergent(self):
        r
        See docs of :obj:`.Sum.is_convergent()` for explanation of convergence

Instances