On the Solvability of the Periodic Problem for Systems of Linear Functional Differential Equations with Regular Operators (original) (raw)

Abstract. Systems of two linear functional differential equations of the first order with regular operators are considered. General necessary and sufficient conditions for the unique solvability of the periodic problem are obtained. For one system with monotone operators ...

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Solvability of a periodic boundary-value problem for systems of functional differential equations with cyclic matrices

Russian Mathematics, 2011

We consider first-order systems of linear functional differential equations with regular operators. For families of systems of two equations we obtain the general necessary and sufficient conditions for the unique solvability of a periodic boundary-value problem. For families of systems of n linear functional differential equations with cyclic matrices we obtain effective necessary and sufficient conditions for the unique solvability of a periodic boundary-value problem.

Periodic solutions of first order functional differential equations

2011

We study the existence of T-periodic solutions of some first order functional differential equations. Several existence criteria are established for our problems; in particular, we obtain conditions for the existence of multiple (even infinitely many) T-periodic solutions of one of the problems. Examples are also included to illustrate our results.

Periodic solutions for functional–differential equations of mixed type

Journal of Mathematical Analysis and Applications, 2007

In this paper we study the existence of ω-periodic solutions for some functional-differential equations of mixed type. Among the main results are the averaging principle and existence theorems for some equations with homogeneous nonlinearities. We use here the coincidence degree theory of Mawhin.

Uniqueness of periodic solutions to periodic linear functional differential equations with finite delay

submitted

We investigate criteria for the uniqueness of (mild) periodic solutions to periodic linear functional differential equations with finite delay in Banach spaces. Its arguments are carried out by materializing the theory of seni-Fredholm operators mathrmadotmathrmnmathrmd\mathrm{a}\dot{\mathrm{n}}\mathrm{d}mathrmadotmathrmnmathrmd by using the standard way. In particular, two sufficient conditions ensuring the uniqueness of periodic solutions are obtained : they are independent of each other. [28][29][30][31][32][33][34][35][36]

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