Stability Results for Two-Dimensional Systems of Fractional-Order Difference Equations

Oana Brandibur, Eva Kaslik, Dorota Mozyrska and Małgorzata Wyrwas
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Oana Brandibur: Department of Mathematics and Computer Science, West University of Timişoara, 300223 Timişoara, Romania
Eva Kaslik: Department of Mathematics and Computer Science, West University of Timişoara, 300223 Timişoara, Romania
Dorota Mozyrska: Faculty of Computer Science, Białystok University of Technology, 15-351 Białystok, Poland
Małgorzata Wyrwas: Faculty of Computer Science, Białystok University of Technology, 15-351 Białystok, Poland

Mathematics, 2020, vol. 8, issue 10, 1-17

Abstract: Linear autonomous incommensurate systems that consist of two fractional-order difference equations of Caputo-type are studied in terms of their asymptotic stability and instability properties. More precisely, the asymptotic stability of the considered linear system is fully characterized, in terms of the fractional orders of the considered Caputo-type differences, as well as the elements of the linear system’s matrix and the discretization step size. Moreover, fractional-order-independent sufficient conditions are also derived for the instability of the system under investigation. With the aim of exemplifying the theoretical results, a fractional-order discrete version of the FitzHugh–Nagumo neuronal model is constructed and analyzed. Furthermore, numerical simulations are undertaken in order to substantiate the theoretical findings, showing that the membrane potential may exhibit complex bursting behavior for suitable choices of the model parameters and fractional orders of the Caputo-type differences.

Keywords: caputo-type fractional difference; fractional difference equation; incommensurate fractional-order system; stability; instability; bifurcation (search for similar items in EconPapers)
JEL-codes: C (search for similar items in EconPapers)
Date: 2020
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