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A new approach to bounded linear operators on C(ω*)

Grzech M.

Czasopismo Techniczne. Nauki Podstawowe

2014

R. 111, z. 3-NP

5--8

We discuss recent results on the connection between properties of a given bounded linear operator of C(ω*) and topological properties of some subset of ω* which the operator determines. A family of closed subsets of ω*, which codes some properties of the operator is defined. An example of application of the method is presented.

Artykuł przedstawia metodę badania własności ograniczonego operatora liniowego na C(ω*) poprzez badanie własności pewnej rodziny domkniętych pozbiorów ω* wyznaczonej przez ten operator. Przedstawiony został przykład zastosowania tej metody w przypadku projekcji.

Structure of the fixed point set of asymptotically nonexpansive mappings in Banach spaces with weak uniformly normal structure

Sahu D. R., Agarwal R. P., O'Regan D.

Journal of Applied Analysis

2011

Vol. 17, nr 1

51-68

This paper is concerned with weak uniformly normal structure and the structure of the set of fixed points of Lipschitzian mappings. It is shown that in a Banach space X with weak uniformly normal structure, every asymptotically regular Lipschitzian semigroup of self-mappings defined on a weakly compact convex subset of X satisfies the (ω)-fixed point property. We show that if X has a uniformly Gâteaux differentiable norm, then the set of fixed points of every asymptotically nonexpansive mapping is nonempty and sunny nonexpansive retract of C. Our results improve several known fixed point theorems for the class of Lipschitzian mappings in a general Banach space.

Implicit and explicit constructions of sunny nonexpansive retractions in Banach spaces

Aleyner A., Reich S.

Journal of Mathematics and Applications

2007

Vol. 29

5-16

Implicit and explicit processes for eonstructing the unique sunny nonexpansive retraction onto the common fixed point set of either a finite or infmite family of nonexpansive mappings in a Banach space are proposed and corresponding convergence theorems are established.

Notes on retracts of coset spaces

Mill J. van, Ridderbos G. J.

Bulletin of the Polish Academy of Sciences. Mathematics

2005

Vol. 53, no 2

169-179

We study retracts of coset spaces. We prove that in certain spaces the set of points that are contained in a component of dimension less than or equal to n, is a closed set. Using our techniques we are able to provide new examples of homogeneous spaces that are not coset spaces. We provide an example of a compact homogeneous space which is not a coset space. We further provide an example of a compact metrizable space which is a retract of a homogeneous compact space, but which is not a retract of a homogeneous metrizable compact space.