Adaptive Functional Projective Lag Synchronization of a Hyperchaotic R ssler System

We explain the functional projective lag synchronization of a hyperchaotic R ssler system with four unknown parameters, where the output of the master system lags behind the output of the slave system proportionally. Based on Lyapunov stability theory, an active control method and adaptive control law are employed to make the states of two hyperchaotic R ssler systems asymptotically synchronized. Finally, some numerical examples are provided to show the effectiveness of our results.