tailieunhanh - Báo cáo hóa học: "HILLE-KNESER-TYPE CRITERIA FOR SECOND-ORDER DYNAMIC EQUATIONS ON TIME SCALES"

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: HILLE-KNESER-TYPE CRITERIA FOR SECOND-ORDER DYNAMIC EQUATIONS ON TIME SCALES | HILLE-KNESER-TYPE CRITERIA FOR SECOND-ORDER DYNAMIC EQUATIONS ON TIME SCALES L. ERBE A. PETERSON AND S. H. SAKER Received 31 January 2006 Revised 16 May 2006 Accepted 16 May 2006 We consider the pair of second-order dynamic equations r t xA Y A p t xY t 0 and r t xA Y A p t xYa t 0 on a time scale T where Y 0 is a quotient of odd positive integers. We establish some necessary and sufficient conditions for nonoscillation of Hille-Kneser type. Our results in the special case when T R involve the well-known Hille-Kneser-type criteria of second-order linear differential equations established by Hille. For the case of the second-order half-linear differential equation our results extend and improve some earlier results of Li and Yeh and are related to some work of Dosly and Rehak and some results of Rehak for half-linear equations on time scales. Several examples are considered to illustrate the main results. Copyright 2006 L. Erbe et al. This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use distribution and reproduction in any medium provided the original work is properly cited. 1. Introduction The theory of time scales which has recently received a lot of attention was introduced by Stefan Hilger in his . thesis in 1988 in order to unify continuous and discrete analysis see 19 . This theory of dynamic equations unifies the theories of differential equations and difference equations and also extends these classical cases to situations in between for example to the so-called -difference equations and can be applied on different types of time scales. Many authors have expounded on various aspects of the new theory. A book on the subject of time scales that is measure chains by Bohner and Peterson 5 summarizes and organizes much of time scale calculus for dynamic equations. For advances on dynamic equations on time scales we refer the reader to the book by Bohner and Peterson 6 . In recent years there

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