Algebraic criteria of stability of periodically non - stationary and nonlinear control systems

In clause are considered scalar periodically non-stationary and on-line nonlinear control systems. Research is constructed on use of criterion Bongiorno, V.L.Haritonova's theorem, the analysis of the equation of the indignant movement of nonlinear system, and also unifrequent approach. A number of the algebraic sufficient and approached criteria of stability of non-stationary systems and the compelled periodic processes in systems with nonlinearity belonging sector is received.