Tag: Banach

Free Download Banach Space Complexes By Cǎlin-Grigore Ambrozie, Florian-Horia Vasilescu (auth.), Cǎlin-Grigore Ambrozie, Florian-Horia Vasilescu (eds.)
1995 | 213 Pages | ISBN: 9401041687 | PDF | 18 MB
The aim of this work is to initiate a systematic study of those properties of Banach space complexes that are stable under certain perturbations. A Banach space complex is essentially an object of the form 1 op-l oP +1 … –+ XP- –+ XP –+ XP –+ … , where p runs a finite or infiniteinterval ofintegers, XP are Banach spaces, and oP : Xp ….. Xp+1 are continuous linear operators such that OPOp-1 = 0 for all indices p. In particular, every continuous linear operator S : X ….. Y, where X, Yare Banach spaces, may be regarded as a complex: O ….. X ~ Y ….. O. The already existing Fredholm theory for linear operators suggested the possibility to extend its concepts and methods to the study of Banach space complexes. The basic stability properties valid for (semi-) Fredholm operators have their counterparts in the more general context of Banach space complexes. We have in mind especially the stability of the index (i.e., the extended Euler characteristic) under small or compact perturbations, but other related stability results can also be successfully extended. Banach (or Hilbert) space complexes have penetrated the functional analysis from at least two apparently disjoint directions. A first direction is related to the multivariable spectral theory in the sense of J. L.

Free Download Series in Banach Spaces: Conditional and Unconditional Convergence By Mikhail I. Kadets, Vladimir M. Kadets (auth.)
1996 | 159 Pages | ISBN: 3034899424 | PDF | 13 MB
Series of scalars, vectors, or functions are among the fundamental objects of mathematical analysis. When the arrangement of the terms is fixed, investigating a series amounts to investigating the sequence of its partial sums. In this case the theory of series is a part of the theory of sequences, which deals with their convergence, asymptotic behavior, etc. The specific character of the theory of series manifests itself when one considers rearrangements (permutations) of the terms of a series, which brings combinatorial considerations into the problems studied. The phenomenon that a numerical series can change its sum when the order of its terms is changed is one of the most impressive facts encountered in a university analysis course. The present book is devoted precisely to this aspect of the theory of series whose terms are elements of Banach (as well as other topological linear) spaces. The exposition focuses on two complementary problems. The first is to char acterize those series in a given space that remain convergent (and have the same sum) for any rearrangement of their terms; such series are usually called uncon ditionally convergent. The second problem is, when a series converges only for certain rearrangements of its terms (in other words, converges conditionally), to describe its sum range, i.e., the set of sums of all its convergent rearrangements.

Free Download Gilles Pisier, "Factorization of Linear Operators and Geometry of Banach Spaces "
English | ISBN: 0821807102 | | 154 pages | PDF | 5 MB
This book surveys the considerable progress made in Banach space theory as a result of Grothendieck’s fundamental paper Resumé de la théorie métrique des produits tensoriels topologiques. The author examines the central question of which Banach spaces $X$ and $Y$ have the property that every bounded operator from $X$ to $Y$ factors through a Hilbert space, in particular when the operators are defined on a Banach lattice, a $C^*$-algebra or the disc algebra and $H^\infty$. He reviews the six problems posed at the end of Grothendieck’s paper, which have now all been solved (except perhaps the exact value of Grothendieck’s constant), and includes the various results which led to their solution. The last chapter contains the author’s construction of several Banach spaces such that the injective and projective tensor products coincide; this gives a negative solution to Grothendieck’s sixth problem.

Free Download Analysis in Banach Spaces: Volume III: Harmonic Analysis and Spectral Theory by Tuomas Hytönen , Jan van Neerven , Mark Veraar , Lutz Weis
English | PDF (True) | 2023 | 839 Pages | ISBN : 3031465970 | 15.2 MB
This third volume of Analysis in Banach Spaces offers a systematic treatment of Banach space-valued singular integrals, Fourier transforms, and function spaces. It further develops and ramifies the theory of functional calculus from Volume II and describes applications of these new notions and tools to the problem of maximal regularity of evolution equations. The exposition provides a unified treatment of a large body of results, much of which has previously only been available in the form of research papers. Some of the more classical topics are presented in a novel way using modern techniques amenable to a vector-valued treatment. Thanks to its accessible style with complete and detailed proofs, this book will be an invaluable reference for researchers interested in functional analysis, harmonic analysis, and the operator-theoretic approach to deterministic and stochastic evolution equations.