Fig. 1
From: A novel 4D chaotic system coupling with dual-memristors and application in image encryption

The Lyapunov exponents and Poincare map corresponding to a = 4.2, b = 1, c = 2, and IC = (0.1, 0.1, 0.1). (a) Lyapunov exponents. (b) Poincare map when z = 0.1.