A new piecewise linear Chen system of fractional-order: Numerical approximation of stable attractors*
Danca Marius-F.a),b)†, Aziz-Alaoui M. A.c)‡, Small Michaeld)§
       
(a) Graph of the sigmoid function for a large value of δ : δ = 10−1; (b) graph of the sigmoid function depending on δ .