Figure 3

Uniformly asymptotic stability. (a) Time-series $x_1^{\ast }(n)$ with initial values $x_1^{\ast }(-1)=1.06$, $x_1^{\ast }(0)=1.02$ and $x_1(n)$ with initial values $x_1(-1)=0.87$, $x_1(0)=0.92$ for $n\in [0,100]$, respectively. (b) Time-series $x_2^{\ast }(n)$ with initial values $x_2^{\ast }(-1)=0.85$, $x_2^{\ast }(0)=0.98$ and $x_2(n)$ with initial values $x_2(-1)=1.15$, $x_2(0)=1.25$ for $n\in [0,100]$, respectively.