TAILIEUCHUNG - Báo cáo hóa học: " Research Article On Fixed Point Theorems of Mixed Monotone Operators"

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 On Fixed Point Theorems of Mixed Monotone Operators | Hindawi Publishing Corporation Fixed Point Theory and Applications Volume 2011 Article ID 563136 8 pages doi 2011 563136 Research Article On Fixed Point Theorems of Mixed Monotone Operators Xinsheng Du and Zengqin Zhao School of Mathematics Sciences Qufu Normal University Qufu Shandong 273165 China Correspondence should be addressed to Xinsheng Du duxinsheng@ Received 11 November 2010 Accepted 4 January 2011 Academic Editor T. Benavides Copyright 2011 X. Du and Z. Zhao. 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. We obtain some new existence and uniqueness theorems of positive fixed point of mixed monotone operators in Banach spaces partially ordered by a cone. Some results are new even for increasing or decreasing operators. 1. Introduction Mixed monotone operators were introduced by Guo and Lakshmikantham in 1 in 1987. Thereafter many authors have investigated these kinds of operators in Banach spaces and obtained a lot of interesting and important results. They are used extensively in nonlinear differential and integral equations. In this paper we obtain some new existence and uniqueness theorems of positive fixed point of mixed monotone operators in Banach spaces partially ordered by a cone. Some results are new even for increasing or decreasing operators. Let the real Banach space E be partially ordered by a cone P of E that is x y if and only if y - x e P. A P X P P is said to be a mixed monotone operator if A x y is increasing in x and decreasing in y that is Ui Vi i 1 2 e P u1 u2 v1 v2 implies A u1 v1 A u2 v2 . Element x e P is called a fixed point of A if A x x x. Recall that cone P is said to be solid if the interior P is nonempty and we denote x 0 if x e P. P is normal if there exists a positive constant N such that 0 x y implies xH Nllyn N is called the normal .

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