Abstract
This paper investigates a rule of nonlinear systems exhibiting chaotic phenomena. A typical ferroresonant circuit is studied by the Chua-type magnetization model representing magnetodynamics. The nonlinear calculation with state variable equation is carried out to clarify the ferroresonant phenomenon. The characteristic values of the state transition matrix are also calculated in each of iteration steps. It reveals that they have no hysteretic properties even though chaotic behavior is exhibiting.