Some recent advances in the analysis and synthesis of nonlinear systems

DURING the past two decades a great deal of material has appeared in the literature concerning the analysis and synthesis of nonlinear systems. In reference 1, a great many of these techniques are reviewed and it is quite evident that these methods are highly specialized pertaining to particular problems. Some are linearization techniques and others are approximations, sometimes quite restricted. Each has its particular value and usefulness. Despite the number of papers, there seems to be no underlying or unifying theory connecting them.