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A fixed point theorem with applications to convolution equations

Published online by Cambridge University Press:  09 April 2009

R. E. Edwards
Affiliation:
Department of Mathematics, Institute of Advanced Studies, A.N.U.
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The well-known Banach Contraction Principle asserts that any self-map F of a complete metric space M with the property that, for some number k < 1, for all x, y,∈M, possesses a unique fixed point in M. some extensions and analogues have recently been given by Edelstein [1]. For the reader's convenlience we state here the result of Edelstein which we shall employ. It asserts that if F is a self-map of a metric space M having the property that for any two distinct points x and y of M, and if x0 is a point of M such that the sequence of iterates xn = Fn (x0) contains a subsequence which converges in M, then the limit of this subsequence is the unique fixed point of F.

Type
Research Article
Copyright
Copyright © Australian Mathematical Society 1963

References

[1]Edelstein, M., On fixed and periodic points under contractive mappings. Journal London Math. Soc., 37 (1962), 7479.CrossRefGoogle Scholar
[2]Malgrange, B., Existence et approximation des solutions des équations aux dérivées partielles et des équations de convolution. Thése. Paris (1955).Google Scholar