TAILIEUCHUNG - Hindawi Publishing Corporation Fixed Point Theory and Applications Volume 2010, Article ID 126192, 8

Hindawi Publishing Corporation Fixed Point Theory and Applications Volume 2010, Article ID 126192, 8 pages doi: Research Article Existence of Solution and Positive Solution for a Nonlinear Third-Order m-Point BVP Jian-Ping Sun and Fan-Xia Jin Department of Applied Mathematics, Lanzhou University of Technology, Lanzhou, Gansu 730050, China Correspondence should be addressed to Jian-Ping Sun, jpsun@ Received 5 November 2010; Accepted 14 December 2010 Academic Editor: Tomonari Suzuki Copyright q 2010 . Sun and . Jin. 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. | Hindawi Publishing Corporation Fixed Point Theory and Applications Volume 2010 Article ID 126192 8 pages doi 2010 126192 Research Article Existence of Solution and Positive Solution for a Nonlinear Third-Order m-Point BVP Jian-Ping Sun and Fan-Xia Jin Department of Applied Mathematics Lanzhou University of Technology Lanzhou Gansu 730050 China Correspondence should be addressed to Jian-Ping Sun jpsun@ Received 5 November 2010 Accepted 14 December 2010 Academic Editor Tomonari Suzuki Copyright 2010 . Sun and . Jin. 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. In this paper we are concerned with the following nonlinear third-order m-point boundary value problem u f f t u t u t 0 t e 0 1 u 0 A u 1 - 2m12 aiu ỉf B u 0 C. Some existence criteria of solution and positive solution are established by using the Schauder fixed point theorem. An example is also included to illustrate the importance of the results obtained. 1. Introduction Third-order differential equations arise in a variety of different areas of applied mathematics and physics for example in the deflection of a curved beam having a constant or varying cross-section a three-layer beam electromagnetic waves or gravity-driven flows and so on 1 . Recently third-order two-point or three-point boundary value problems BVPs have received much attention from many authors see 2-10 and the references therein. In particular Yao 10 employed the Leray-Schauder fixed point theorem to prove the existence of solution and positive solution for the BVP u t f t u t u Jf 0 t e 0 1 u 0 A u 1 B u 0 C. Although there are many excellent results on third-order two-point or three-point BVPs few works have been done for more general third-order m-point BVPs 11-13 . It is 2 Fixed Point Theory and Applications worth mentioning that Jin and Lu 12 .

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