tailieunhanh - EXISTENCE AND UNIQUENESS OF SOLUTIONS OF HIGHER-ORDER ANTIPERIODIC DYNAMIC EQUATIONS ALBERTO CABADA

EXISTENCE AND UNIQUENESS OF SOLUTIONS OF HIGHER-ORDER ANTIPERIODIC DYNAMIC EQUATIONS ALBERTO CABADA AND DOLORES R. VIVERO Received 8 October 2003 and in revised form 9 February 2004 We prove existence and uniqueness results in the presence of coupled lower and upper solutions for the general nth problem in time scales with linear dependence on the ith ∆derivatives for i = 1,2,.,n, together with antiperiodic boundary value conditions. Here the nonlinear right-hand side of the equation is defined by a function f (t,x) which is rd-continuous in t and continuous in x uniformly in t. To do that, we obtain the expression of. | EXISTENCE AND UNIQUENESS OF SOLUTIONS OF HIGHER-ORDER ANTIPERIODIC DYNAMIC EQUATIONS ALBERTO CABADA AND DOLORES R. VIVERO Received 8 October 2003 and in revised form 9 February 2004 We prove existence and uniqueness results in the presence of coupled lower and upper solutions for the general nth problem in time scales with linear dependence on the zth A-derivatives for i 1 2 . n together with antiperiodic boundary value conditions. Here the nonlinear right-hand side of the equation is defined by a function f t x which is rd-continuous in t and continuous in x uniformly in t. To do that we obtain the expression of the Green s function of a related linear operator in the space of the antiperiodic functions. 1. Introduction The theory of dynamic equations has been introduced by Stefan Hilger in his . thesis 12 . This new theory unifies difference and differential equations and has experienced an important growth in the last years. Recently many papers devoted to the study of this kind of problems have been presented. In the monographs of Bohner and Peterson 5 6 there are the fundamental tools to work with this type of equations. Surveys on this theory given by Agarwal et al. 2 and Agarwal et al. 1 give us an idea of the importance of this new field. In this paper we study the existence and uniqueness of solutions of the following nth-order dynamic equation with antiperiodic boundary value conditions Ln n-1 uAn t yMjUAi t f t u t vt e I a b uA a -uA ơ b 0 i n - 1. Here n 1 Mj e R are given constants for i e 1 . n - 1 a b TKn with T c R an arbitrary bounded time scale and f I X R R satisfies the following condition Copyright 2004 Hindawi Publishing Corporation Advances in Difference Equations 2004 4 2004 291-310 2000 Mathematics Subject Classification 39A10 URL http S1687183904310022 292 Higher-order antiperiodic dynamic equations Hf for all x G R f x G Crd I and f t G C R uniformly at t G I that is for all e 0 there exists 8 0 such that x- y

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