Existence of periodic solutions for first-order totally nonlinear neutral differential equations with variable delay

Commentationes mathematicae Universitatis Carolinae

Abdelouaheb Ardjouni¹ 

关键词: periodic solution;    nonlinear neutral differential equation;    large contraction;    integral equation;   

DOI  :  

学科分类：物理化学和理论化学

来源: Univerzita Karlova v Praze * Matematicko-Fyzikalni Fakulta / Charles University in Prague, Faculty of Mathematics and Physics

【 摘 要 】

We use a modification of Krasnoselskii's fixed point theorem due to Burton (see [{\it Liapunov functionals, fixed points and stability by Krasnoselskii's theorem\/}, Nonlinear Stud. {\bf 9} (2002), 181--190], Theorem~3) to show that the totally nonlinear neutral differential equation with variable delay \begin{equation*} x'(t) = -a(t)h (x(t)) + c(t)x'(t-g(t))Q' (x(t-g(t))) + G (t,x(t),x(t-g(t))), \end{equation*} has a periodic solution. We invert this equation to construct a fixed point mapping expressed as a sum of two mappings such that one is compact and the other is a large contraction. We show that the mapping fits very nicely for applying the modification of Krasnoselskii's theorem so that periodic solutions exist.

【 授权许可】

CC BY