def __mul__(self,other):
if self.parent() != other.parent():
# should implement coercion here
raise NotImplementedError
if self.is_exact():
return self
if other.is_exact():
return other
if self.__class__ is other.__class__:
return self._mul_(other)
return coerce_bigoh(self,other,mul)
def intersection(self,other):
if self.parent() != other.parent():
# should implement coercion here
raise NotImplementedError
if self.is_exact():
return self
if other.is_exact():
return other
if self.__class__ is other.__class__:
return self._intersection(other)
return coerce_bigoh(self,other,self.__class__.intersection)