 The general solution by definition is completely stable; otherwise the Universe would not exist.Any [[Perturbation (astronomy)|perturbation]] is equivalent to a change in the initial conditions in some moment of time; since the general solution allows arbitrary initial conditions, the perturbation is not able to change its character.In other words, the existence of the limiting condition λ = 0 for the solution of means instability caused by perturbations that break this condition.