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Functional Calculi

2013-03-26 Mathematics
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Release : 2013-03-26
Genre : Mathematics
Kind : eBook
Book Rating : 995/5 ( reviews)

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Book Synopsis Functional Calculi by : Charles W Swartz

Download or read book Functional Calculi written by Charles W Swartz. This book was released on 2013-03-26. Available in PDF, EPUB and Kindle. Book excerpt: A functional calculus is a construction which associates with an operator or a family of operators a homomorphism from a function space into a subspace of continuous linear operators, i.e. a method for defining “functions of an operator”. Perhaps the most familiar example is based on the spectral theorem for bounded self-adjoint operators on a complex Hilbert space.This book contains an exposition of several such functional calculi. In particular, there is an exposition based on the spectral theorem for bounded, self-adjoint operators, an extension to the case of several commuting self-adjoint operators and an extension to normal operators. The Riesz operational calculus based on the Cauchy integral theorem from complex analysis is also described. Finally, an exposition of a functional calculus due to H. Weyl is given.

Existence Families, Functional Calculi and Evolution Equations

2006-11-15 Mathematics
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Release : 2006-11-15
Genre : Mathematics
Kind : eBook
Book Rating : 225/5 ( reviews)

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Book Synopsis Existence Families, Functional Calculi and Evolution Equations by : Ralph DeLaubenfels

Download or read book Existence Families, Functional Calculi and Evolution Equations written by Ralph DeLaubenfels. This book was released on 2006-11-15. Available in PDF, EPUB and Kindle. Book excerpt: This book presents an operator-theoretic approach to ill-posed evolution equations. It presents the basic theory, and the more surprising examples, of generalizations of strongly continuous semigroups known as 'existent families' and 'regularized semigroups'. These families of operators may be used either to produce all initial data for which a solution in the original space exists, or to construct a maximal subspace on which the problem is well-posed. Regularized semigroups are also used to construct functional, or operational, calculi for unbounded operators. The book takes an intuitive and constructive approach by emphasizing the interaction between functional calculus constructions and evolution equations. One thinks of a semigroup generated by A as etA and thinks of a regularized semigroup generated by A as etA g(A), producing solutions of the abstract Cauchy problem for initial data in the image of g(A). Material that is scattered throughout numerous papers is brought together and presented in a fresh, organized way, together with a great deal of new material.

Concrete Functional Calculus

2010-11-03 Mathematics
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Release : 2010-11-03
Genre : Mathematics
Kind : eBook
Book Rating : 500/5 ( reviews)

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Book Synopsis Concrete Functional Calculus by : R. M. Dudley

Download or read book Concrete Functional Calculus written by R. M. Dudley. This book was released on 2010-11-03. Available in PDF, EPUB and Kindle. Book excerpt: Concrete Functional Calculus focuses primarily on differentiability of some nonlinear operators on functions or pairs of functions. This includes composition of two functions, and the product integral, taking a matrix- or operator-valued coefficient function into a solution of a system of linear differential equations with the given coefficients. In this book existence and uniqueness of solutions are proved under suitable assumptions for nonlinear integral equations with respect to possibly discontinuous functions having unbounded variation. Key features and topics: Extensive usage of p-variation of functions, and applications to stochastic processes. This work will serve as a thorough reference on its main topics for researchers and graduate students with a background in real analysis and, for Chapter 12, in probability.

Noncommutative Functional Calculus

2011-03-18 Mathematics
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Release : 2011-03-18
Genre : Mathematics
Kind : eBook
Book Rating : 106/5 ( reviews)

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Book Synopsis Noncommutative Functional Calculus by : Prof. Fabrizio Colombo Politecnico di Milano

Download or read book Noncommutative Functional Calculus written by Prof. Fabrizio Colombo Politecnico di Milano. This book was released on 2011-03-18. Available in PDF, EPUB and Kindle. Book excerpt: This book presents a functional calculus for n-tuples of not necessarily commuting linear operators. In particular, a functional calculus for quaternionic linear operators is developed. These calculi are based on a new theory of hyperholomorphicity for functions with values in a Clifford algebra: the so-called slice monogenic functions which are carefully described in the book. In the case of functions with values in the algebra of quaternions these functions are named slice regular functions. Except for the appendix and the introduction all results are new and appear for the first time organized in a monograph. The material has been carefully prepared to be as self-contained as possible. The intended audience consists of researchers, graduate and postgraduate students interested in operator theory, spectral theory, hypercomplex analysis, and mathematical physics.

Functional Calculus of Pseudodifferential Boundary Problems

1996-01-26 Mathematics
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Release : 1996-01-26
Genre : Mathematics
Kind : eBook
Book Rating : 385/5 ( reviews)

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Book Synopsis Functional Calculus of Pseudodifferential Boundary Problems by : Gerd Grubb

Download or read book Functional Calculus of Pseudodifferential Boundary Problems written by Gerd Grubb. This book was released on 1996-01-26. Available in PDF, EPUB and Kindle. Book excerpt: Pseudodifferential methods are central to the study of partial differential equations, because they permit an "algebraization." The main purpose of this book is to set up an operational calculus for operators defined from differential and pseudodifferential boundary values problems via a resolvent construction. A secondary purposed is to give a complete treatment of the properties of the calculus of pseudodifferential boundary problems with transmission, both the first version by Boutet de Monvel (brought completely up to date in this edition) and in version containing a parameter running in an unbounded set. And finally, the book presents some applications to evolution problems, index theory, fractional powers, spectral theory and singular perturbation theory. Thus the book’s improved proofs and modern points of view will be useful to research mathematicians and to graduate students studying partial differential equations and pseudodifferential operators.

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