Multistability in Mittag-Leffler sense of fractional-order neural networks with piecewise constant arguments

This paper discusses the multistability in Mittag-Leffler sense of fractional-order neural networks with piecewise constant arguments. According to the boundedness of activation functions and the model of fractional-order neural networks with piecewise constant arguments, n pairs of bounded functions are constructed. On the basis of the sign of the n pairs of bounded functions, the n-dimensional state space is divided into Pi(n)(i=1) (2L(i) + 1) regions. Sufficient conditions are derived to ensure that there exists at leat one equilibrium point in each one of these regions. In addition, Pi(n)(i=1) (L-i + 1) equilibrium points are locally Mittag-Leffler stable. Two numerical examples are provided to demonstrate the validity of the theoretical results. (C) 2018 Elsevier B.V. All rights reserved.