Theoretical Analysis and Adaptive Synchronization of a 4D Hyperchaotic Oscillator

Figure 4

Numerical phase portraits of the system obtained for various values of 𝜎: (a) periodic attractor (𝜎=0.25); (b) 2D torus state (𝜎=0.32); (c) periodic attractor (𝜎=0.4); (d) chaos 𝜎=0.47; (e) hyperchaos state (𝜎=0.65).

(a)

(b)

(c)

(d)

(e)