Steady propagation on both the tapered

and

nonlinear transmission lines is investigated and the existence of various types of neuristor waveforms demonstrated. A generalization of the direct method of Liapunov for distributed parameter systems is employed to determine the stability of the possible steady waveforms. It is shown that the criterion for waveform stability on such active nonlinear transmission lines is simply that the derivative of the steady waveform represents the minimum eigenvalue solution of the linearized perturbation equation.