tailieunhanh - Báo cáo hóa học: " QUASICONTRACTION NONSELF-MAPPINGS ON CONVEX METRIC SPACES AND COMMON FIXED POINT THEOREMS"

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: QUASICONTRACTION NONSELF-MAPPINGS ON CONVEX METRIC SPACES AND COMMON FIXED POINT THEOREMS | QUASICONTRACTION NONSELF-MAPPINGS ON CONVEX METRIC SPACES AND COMMON FIXED POINT THEOREMS LJILJANA GAJIC AND VLADIMIR RAKOCEVIC Received 29 September 2004 and in revised form 24 January 2005 We consider quasicontraction nonself-mappings on Takahashi convex metric spaces and common fixed point theorems for a pair of maps. Results generalizing and unifying fixed point theorems of Ivanov Jungck Das and Naik and Ciric are established. 1. Introduction and preliminaries Let X be a complete metric space. A map T X X such that for some constant A e 0 1 and for every x y e X d Tx Ty A max d x y d x Tx d y Ty d x Ty d y Tx is called quasicontraction. Let us remark that Ciric 1 introduced and studied quasicontraction as one of the most general contractive type map. The well known Ciric s result see . 1 6 11 is that quasicontraction T possesses a unique fixed point. For the convenience of the reader we recall the following recent Ciric s result. Theorem 2 Theorem . Let X be a Banach space C a nonempty closed subset of X and dC the boundary of C. Let T C X be a nonself mapping such that for some constant A e 0 1 and for every x y e C d Tx Ty A max d x y d x Tx d y Ty d x Ty d y Tx . Suppose that T dC c C. Then T has a unique fixed point in C. Following Ciric 3 let us remark that problem to extend the known fixed point theorem for self mappings T C C defined by to corresponding nonself mappings T C X C X was open more than 20 years. In 1970 Takahashi 15 introduced the definition of convexity in metric space and generalized same important fixed point theorems previously proved for Banach spaces. In Copyright 2005 Hindawi Publishing Corporation Fixed Point Theory and Applications 2005 3 2005 365-375 DOI 366 Quasicontraction nonself-mappings this paper we consider quasicontraction nonself-mappings on Takahashi convex metric spaces and common fixed point theorems for a pair of maps. Results generalizing and unifying fixed point .

TÀI LIỆU LIÊN QUAN
crossorigin="anonymous">
Đã phát hiện trình chặn quảng cáo AdBlock
Trang web này phụ thuộc vào doanh thu từ số lần hiển thị quảng cáo để tồn tại. Vui lòng tắt trình chặn quảng cáo của bạn hoặc tạm dừng tính năng chặn quảng cáo cho trang web này.