On Hilberman's theorem and the characterization of ideal op amp semi-indefinite networks
Vinod Kumar Singh · IEEE Transactions on Circuits and Systems · 1988
The application of D. Hilberman's (1973) theorem to construct a simple proof of a theorem on semi-indefinite networks is discussed. The theorem was originally proved by P.R. Bryson and G.M. Wierzba (1982) using the concept of nullator and orator.>