#### Document Type

Post-Print

#### Publication Date

1-2008

#### Abstract

In this paper, we investigate the existence and stability of periodic orbits of the p-periodic difference equation with delays xn = f(n−1, xn−k). We show that the periodic orbits of this equation depend on the periodic orbits of p autonomous equations when p divides k. When p is not a divisor of k, the periodic orbits depend on the periodic orbits of gcd(p, k) nonautonomous p gcd(p,k) - periodic difference equations. We give formulas for calculating the number of different periodic orbits under certain conditions. In addition, when p and k are relatively prime integers, we introduce what we call the pk-Sharkovsky’s ordering of the positive integers, and extend Sharkovsky’s theorem to periodic difference equations with delays. Finally, we characterize global stability and show that the period of a globally asymptotically stable orbit must divide p.

#### Document Object Identifier (DOI)

10.1142/S0218127408020239

#### Repository Citation

Alsharawi, Z., Angelos, J., & Elaydi, S. (2008). Existence and stability of periodic orbits of periodic difference equations with delays. *International Journal of Bifurcation and Chaos*, 18, 203-217. doi: 10.1142/S0218127408020239

#### Publication Information

International Journal of Bifurcation and Chaos