tailieunhanh - Báo cáo hóa học: " A DEGREE THEORY FOR A CLASS OF PERTURBED FREDHOLM MAPS"

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: A DEGREE THEORY FOR A CLASS OF PERTURBED FREDHOLM MAPS | A DEGREE THEORY FOR A CLASS OF PERTURBED FREDHOLM MAPS PIERLUIGI BENEVIERI ALESSANDRO CALAMAI AND MASSIMO FURI Received 26 October 2004 We define a notion of degree for a class of perturbations of nonlinear Fredholm maps of index zero between infinite-dimensional real Banach spaces. Our notion extends the degree introduced by Nussbaum for locally a-contractive perturbations of the identity as well as the recent degree for locally compact perturbations of Fredholm maps of index zero defined by the first and third authors. 1. Introduction In this paper we define a concept of degree for a special class of perturbations of nonlinear Fredholm maps of index zero between infinite-dimensional real Banach spaces called a-Fredholm maps. The definition is based on the following two numbers see . 10 associated with a map f o - F from an open subset of a Banach space E into a Banach space F a f sup 1 f A c o bounded a A 01 a A r i w f inf- f. A c o bounded a A 0 a A where a is the Kuratowski measure of noncompactness in 10 w f is denoted by fi f however since w is the last letter of the Greek alphabet we prefer the notation w f as in 8 . Roughly speaking the a-Fredholm maps are of the type f g - k where g is Fredholm of index zero and k satisfies locally the inequality a k w g . These maps include locally compact perturbations of Fredholm maps called quasiFredholm maps for short since when g is Fredholm and k is locally compact one has Copyright 2005 Hindawi Publishing Corporation Fixed Point Theory and Applications 2005 2 2005 185-206 DOI 186 A degree theory for a class of perturbed Fredholm maps a k 0 and w g 0 locally. Moreover they also contain the a-contractive perturbations of the identity called a-contractive vector fields where following Darbo 5 a map k is a-contractive if a k 1. The degree obtained in this paper is a generalization of the degree for quasi-Fredholm maps defined for the first time in 14 by means of the Elworthy-Tromba .

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