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＜電子ブック＞
Topology and Approximate Fixed Points / by Afif Ben Amar, Donal O'Regan
(Developments in Mathematics. ISSN:2197795X ; 71)

版	1st ed. 2022.
出版者	(Cham : Springer International Publishing : Imprint: Springer)
出版年	2022
本文言語	英語
大きさ	XIII, 251 p : online resource
著者標目	*Ben Amar, Afif author O'Regan, Donal author SpringerLink (Online service)
件　名	LCSH:Functional analysis LCSH:Operator theory LCSH:Topology FREE:Functional Analysis FREE:Operator Theory FREE:Topology
一般注記	Preface -- Basic Concepts -- Almost Fixed Points -- Approximate Fixed Points in Ultrametric Spaces -- Synthetic Approaches to Problems of Fixed Points -- Approximate Fixed Theory in Topological Vector Spaces -- Bibliography This book examines in detail approximate fixed point theory in different classes of topological spaces for general classes of maps. It offers a comprehensive treatment of the subject that is up-to-date, self-contained, and rich in methods, for a wide variety of topologies and maps. Content includes known and recent results in topology (with proofs), as well as recent results in approximate fixed point theory. This work starts with a set of basic notions in topological spaces. Special attention is given to topological vector spaces, locally convex spaces, Banach spaces, and ultrametric spaces. Sequences and function spaces—and fundamental properties of their topologies—are also covered. The reader will find discussions on fundamental principles, namely the Hahn-Banach theorem on extensions of linear (bounded) functionals; the Banach open mapping theorem; the Banach-Steinhaus uniform boundedness principle; and Baire categories, including some applications. Also included areweak topologies and their properties, in particular the theorems of Eberlein-Smulian, Goldstine, Kakutani, James and Grothendieck, reflexive Banach spaces, l_{1}- sequences, Rosenthal's theorem, sequential properties of the weak topology in a Banach space and weak* topology of its dual, and the Fréchet-Urysohn property. The subsequent chapters cover various almost fixed point results, discussing how to reach or approximate the unique fixed point of a strictly contractive mapping of a spherically complete ultrametric space. They also introduce synthetic approaches to fixed point problems involving regular-global-inf functions. The book finishes with a study of problems involving approximate fixed point property on an ambient space with different topologies. By providing appropriate background and up-to-date research results, this book can greatly benefit graduate students and mathematicians seeking to advance in topology and fixed pointtheory HTTP:URL=https://doi.org/10.1007/978-3-030-92204-7

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