tailieunhanh - Báo cáo hóa học: " Research Article Iterated Oscillation Criteria for Delay Dynamic Equations of First Order"

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: Research Article Iterated Oscillation Criteria for Delay Dynamic Equations of First Order | Hindawi Publishing Corporation Advances in Difference Equations Volume 2008 Article ID 458687 12 pages doi 2008 458687 Research Article Iterated Oscillation Criteria for Delay Dynamic Equations of First Order M. Bohner 1 B. Karpuz 2 and O. Ocalan2 1 Department of Economics and Finance Missouri University of Science and Technology Rolla MO 65409-0020 USA 2 Department of Mathematics Faculty of Science and Arts Afyon Kocatepe University ANS Campus 03200 Afyonkarahisar Turkey Correspondence should be addressed to B. Karpuz bkarpuz@ Received 9 June 2008 Accepted 4 December 2008 Recommended by John Graef We obtain new sufficient conditions for the oscillation of all solutions of first-order delay dynamic equations on arbitrary time scales hence combining and extending results for corresponding differential and difference equations. Examples some of which coincide with well-known results on particular time scales are provided to illustrate the applicability of our results. Copyright 2008 M. Bohner 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 Oscillation theory on Z and R has drawn extensive attention in recent years. Most of the results on Z have corresponding results on R and vice versa because there is a very close relation between Z and R. This relation has been revealed by Hilger in 1 which unifies discrete and continuous analysis by a new theory called time scale theory. As is well known a first-order delay differential equation of the form xft p t x t - T 0 where t e R and T e R 0 to is oscillatory if lim inf t to p n dn 1 t-T e 2 Advances in Difference Equations holds 2 Theorem . Also the corresponding result for the difference equation Ax t p t x t - T 0 where t e Z Ax t x t 1 - x t and T e N is liminf V pin T i TO w T 1 n t-T 2 Theorem .

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