特色：
The main purpose of this book is to introduce the latest results of the author and some others on developments in the study of absolute stability of nonlinear control systems in recent years. The characteristics of these results are: theoretically, to give as many as possible necessary and sufficient conditions of absolute stability of various nonlinear control systems in applications, to derive simple enough and even constructive algebraic sufficient conditions from these theoretical necessary and sufficient conditions for use in practical work and in methodology.