Periodicity and stability in neutral nonlinear dynamic equations with functional delay on a time scale

• Main Authors: Eric R. Kaufmann, Youssef N. Raffoul
• Format: Article
• Language: English
• Published: Texas State University 2007-02-01
• Series: Electronic Journal of Differential Equations
• Subjects: Krasnosel'skii; contraction mapping; neutral; nonlinear; delay; time scales; periodic solution; unique solution; stability.
• Online Access: http://ejde.math.txstate.edu/Volumes/2007/27/abstr.html

Let $mathbb{T}$ be a periodic time scale. We use a fixed point theorem due to Krasnosel'skii to show that the nonlinear neutral dynamic equation with delay $$ x^{Delta}(t) = -a(t)x^{sigma}(t) + left(Q(t,x(t), x(t-g(t)))) ight)^{Delta} + Gig(t,x(t), x(t-g(t))ig), t in mathbb{T}, $$ has a periodic solution. Under a slightly more stringent inequality we show that the periodic solution is unique using the contraction mapping principle. Also, by the aid of the contraction mapping principle we study the asymptotic stability of the zero solution provided that $Q(t,0,0)= G(t,0,0) = 0$.