(self)
return self.left is S.NegativeInfinity or self.left == Float("-inf")
Return ``True`` if the left endpoint is negative infinity.
Return ``True`` if the left endpoint is negative infinity.
Return True if the left endpoint is negative infinity .
def is_left_unbounded(self):
        """Return ``True`` if the left endpoint is negative infinity. """
        return self.left is S.NegativeInfinity or self.left == Float("-inf")
def is_left_unbounded ( self ) : return self . left is S . NegativeInfinity or self . left == Float ( "-inf" )