Simplify all scalar expressions within S, L and H

        Return a new :class:`SLH` object with the simplified expressions.

        See also: :meth:`.QuantumExpression.simplify_scalar`

def simplify_scalar(self, func=sympy.simplify):
        """Simplify all scalar expressions within S, L and H

        Return a new :class:`SLH` object with the simplified expressions.

        See also: :meth:`.QuantumExpression.simplify_scalar`
        """
        return SLH(
            self.S.simplify_scalar(func=func),
            self.L.simplify_scalar(func=func),
            self.H.simplify_scalar(func=func))