(self, other)
return self.__add__(-other)
Return the permutation that is other lower in rank than self.

        See Also
        ========

        __add__
Return the permutation that is other lower in rank than self.
Return the permutation that is other lower in rank than self .
def __sub__(self, other):
        """Return the permutation that is other lower in rank than self.

        See Also
        ========

        __add__
        """
        return self.__add__(-other)
def __sub__ ( self , other ) : return self . __add__ ( - other )