Hostname: page-component-cd9895bd7-jkksz Total loading time: 0 Render date: 2024-12-26T01:39:35.910Z Has data issue: false hasContentIssue false

16.—On Uniqueness of Topological Degree for Set-valued Mappings*

Published online by Cambridge University Press:  14 February 2012

J. R. L. Webb
Affiliation:
Department of Mathematics, University of Glasgow.

Synopsis

It is shown that three independent axioms uniquely determine the topological degree of set-valued maps of the form I – G, where G is a convex-valued, limit compact map. This extends earlier work of Amann and Weiss, Nussbaum, and others, in that, apart from dealing with set-valued maps, a larger class of maps is considered even in the single-valued case.

Type
Research Article
Copyright
Copyright © Royal Society of Edinburgh 1976

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

1Amann, H. and Weiss, S.. On the uniqueness of the topological degree. Math. Z. 130 (1973), 3954.CrossRefGoogle Scholar
2Brown, R. F.. An elementary proof of uniqueness of fixed point index. Pacific J. Math. 35 (1970), 549558.CrossRefGoogle Scholar
3Cellina, A. and Lasota, A.. A new approach to the definition of topological degree for multivalued mappings. Atti Accad. Naz. Lincei Rend. Cl. Sci. Fis. Mat. Nat. 47 (1969), 434440.Google Scholar
4Kamke, E.. Theory of sets (New York: Dover, 1950).Google Scholar
5Michael, E.. Continuous selections. I. Am. of Math. 63 (1956), 361382.Google Scholar
6Nussbaum, R. D.. On the uniqueness of the topological degree for k-set-contractions. Math. Z. 137 (1974), 18.CrossRefGoogle Scholar
7O'Neill, B.. Essential sets and fixed points. Amer. J. Math 75 (1953), 497509.CrossRefGoogle Scholar
8Petryshyn, W. V. and Fitzpatrick, P. M.. Degree theory for noncompact multivalued vector fields. Bull. Amer. Math. Soc 79 (1973), 609613.CrossRefGoogle Scholar
9Rudin, W.. Functional analysis (New York: McGraw-Hill, 1973).Google Scholar
10Sadovsky, B. N.. Limit compact and condensing operators (English translation). Russian Math. Surveys. 27 (1972), 85155.CrossRefGoogle Scholar
11Thomas, J. W.. A bifurcation theorem for k-set contractions. Pacific J. Math. 44 (1973), 749756.CrossRefGoogle Scholar
12Webb, J. R. L.. On degree theory for multivalued mappings and applications. Boll. Un. Mat Ital 9 (1974), 137158.Google Scholar