tailieunhanh - Báo cáo hóa học: "EXISTENCE FOR A CLASS OF DISCRETE HYPERBOLIC PROBLEMS"

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: EXISTENCE FOR A CLASS OF DISCRETE HYPERBOLIC PROBLEMS | EXISTENCE FOR A CLASS OF DISCRETE HYPERBOLIC PROBLEMS RODICA LUCA Received 1 November 2005 Revised 10 March 2006 Accepted 7 April 2006 We investigate the existence and uniqueness of solutions to a class of discrete hyperbolic systems with some nonlinear extreme conditions and initial data in a real Hilbert space. Copyright 2006 Rodica Luca. 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 Let H be a real Hilbert space with the scalar product and the associated norm II II. In this paper we will investigate the discrete hyperbolic system du Vj t - Vj-1 t . . t ------h-------- A Uj t 3 fj t dV j Ui 1 t - Uj t . j 1 N t e 0 T in H s t j 1 i Uj B Vj t 3 gj t dt h j with the extreme conditions V0 t -a u1 t UN 1 t PV t t e 0 T EC and the initial data Uj 0 Uj0 Vj 0 Vj0 j 1 N ID where N e N hj 0 j 1 N and a p A B are operators in H which satisfy some assumptions. Hindawi Publishing Corporation Advances in Difference Equations Volume 2006 Article ID 89260 Pages 1-14 DOI ADE 2006 89260 2 Existence for a class of discrete hyperbolic problems This problem is a discrete version with respect to x with H R of the problem du X . dv dt t x dx t x A u t x 3 f t x dv . X . du dt t x dX t x B v t x 3 g t x 0 x 1 t 0 in R S with the boundary conditions v t 0 -a u t 0 u t 1 v t 1 t 0 BC and the initial data u 0 x u0 x v 0 x v0 x 0 x 1. IC The above problem has applications in electrotechnics the propagation phenomena in electrical networks and mechanics the variable flow of a fluid see 7 8 13 . The system S subject to various boundary conditions has been studied by many authors Barbu Iftimie Morosanu and Luca in 4 5 9 11 12 . Using an idea from 14 we discretize the problem S BC IC in this way let N be a given integer N 1 and h 1 N 1 . In a first stage we approximate the system S and the boundary .

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