human
Complete the below
def function_application(func):

    ''''Factory function for producing function application methods for Factor
    subclasses.'
    '''

=====
Write me a the Python program you requested?
assistant
#Here is the Python program you requested.
    if (func not in NUMEXPR_MATH_FUNCS):
        raise ValueError(("Unsupported    mathematical    function    '%s'" % func))
    @with_doc(func)
    @with_name(func)
    def mathfunc(self):
        if isinstance(self, NumericalExpression):
            return NumExprFactor('{func}({expr})'.format(func=func, expr=self._expr), self.inputs, dtype=float64_dtype)
        else:
            return NumExprFactor('{func}(x_0)'.format(func=func), (self,), dtype=float64_dtype)
    return mathfunc