Gets the strain from a stress state according
        to the compliance expansion corresponding to the
        tensor expansion.

def get_strain_from_stress(self, stress):
        """
        Gets the strain from a stress state according
        to the compliance expansion corresponding to the
        tensor expansion.
        """
        compl_exp = self.get_compliance_expansion()
        strain = 0
        for n, compl in enumerate(compl_exp):
            strain += compl.einsum_sequence([stress]*(n+1)) / factorial(n+1)
        return strain