Active Sliding Mode for Synchronization of a Wide Class of Four-Dimensional Fractional-Order Chaotic Systems

Figure 6

Synchronization errors between the noncommensurate fractional-order Lorenz system and commensurate fractional-order Lü system.

(a) 𝑒₁

(b) 𝑒₂

(c) 𝑒₃

(d) 𝑒₄