Nonlinear Control of Chaos

The nonlinear and the exact control of chaos is deduced. Using these methods we achieve a simultaneous and instantaneous control of the scheduled unstable 2^kp points for the logistic and the Henon map. The derivatives needed in the nonlinear method have been evaluated experimentally from the time series x_n, without the pre-knowledge of the function f(x). The difficulty confronted in the optimum control may be overcome by introducing the nonlinear control.