Positive Semigroups of Operators, and Applications

Positive Semigroups of Operators, and Applications

Author: O. Bratteli

Publisher: Springer Science & Business Media

Published: 2012-12-06

Total Pages: 200

ISBN-13: 9400964846

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This means that semigroup theory may be applied directly to the study of the equation I'!.f = h on M. In [45] Yau proves that, for h ~ 0, there are no nonconstant, nonnegative solutions f in [j' for 1


Positive Operator Semigroups

Positive Operator Semigroups

Author: András Bátkai

Publisher: Birkhäuser

Published: 2017-02-13

Total Pages: 366

ISBN-13: 3319428136

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This book gives a gentle but up-to-date introduction into the theory of operator semigroups (or linear dynamical systems), which can be used with great success to describe the dynamics of complicated phenomena arising in many applications. Positivity is a property which naturally appears in physical, chemical, biological or economic processes. It adds a beautiful and far reaching mathematical structure to the dynamical systems and operators describing these processes. In the first part, the finite dimensional theory in a coordinate-free way is developed, which is difficult to find in literature. This is a good opportunity to present the main ideas of the Perron-Frobenius theory in a way which can be used in the infinite dimensional situation. Applications to graph matrices, age structured population models and economic models are discussed. The infinite dimensional theory of positive operator semigroups with their spectral and asymptotic theory is developed in the second part. Recent applications illustrate the theory, like population equations, neutron transport theory, delay equations or flows in networks. Each chapter is accompanied by a large set of exercises. An up-to-date bibliography and a detailed subject index help the interested reader. The book is intended primarily for graduate and master students. The finite dimensional part, however, can be followed by an advanced bachelor with a solid knowledge of linear algebra and calculus.


A Short Course on Operator Semigroups

A Short Course on Operator Semigroups

Author: Klaus-Jochen Engel

Publisher: Springer Science & Business Media

Published: 2006-06-06

Total Pages: 257

ISBN-13: 0387313419

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The book offers a direct and up-to-date introduction to the theory of one-parameter semigroups of linear operators on Banach spaces. The book is intended for students and researchers who want to become acquainted with the concept of semigroups.


Markov Operators, Positive Semigroups and Approximation Processes

Markov Operators, Positive Semigroups and Approximation Processes

Author: Francesco Altomare

Publisher: Walter de Gruyter GmbH & Co KG

Published: 2015-12-18

Total Pages: 399

ISBN-13: 3110386410

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This research monograph gives a detailed account of a theory which is mainly concerned with certain classes of degenerate differential operators, Markov semigroups and approximation processes. These mathematical objects are generated by arbitrary Markov operators acting on spaces of continuous functions defined on compact convex sets; the study of the interrelations between them constitutes one of the distinguishing features of the book. Among other things, this theory provides useful tools for studying large classes of initial-boundary value evolution problems, the main aim being to obtain a constructive approximation to the associated positive C0-semigroups by means of iterates of suitable positive approximating operators. As a consequence, a qualitative analysis of the solutions to the evolution problems can be efficiently developed. The book is mainly addressed to research mathematicians interested in modern approximation theory by positive linear operators and/or in the theory of positive C0-semigroups of operators and evolution equations. It could also serve as a textbook for a graduate level course.


Semigroups of Operators -Theory and Applications

Semigroups of Operators -Theory and Applications

Author: Jacek Banasiak

Publisher: Springer

Published: 2014-11-20

Total Pages: 338

ISBN-13: 3319121456

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Many results, both from semi group theory itself and from the applied sciences, are phrased in discipline-specific languages and hence are hardly known to a broader community. This volume contains a selection of lectures presented at a conference that was organised as a forum for all mathematicians using semi group theory to learn what is happening outside their own field of research. The collection will help to establish a number of new links between various sub-disciplines of semigroup theory, stochastic processes, differential equations and the applied fields. The theory of semigroups of operators is a well-developed branch of functional analysis. Its foundations were laid at the beginning of the 20th century, while the fundamental generation theorem of Hille and Yosida dates back to the forties. The theory was, from the very beginning, designed as a universal language for partial differential equations and stochastic processes, but at the same time it started to live as an independent branch of operator theory. Nowadays, it still has the same distinctive flavour: it develops rapidly by posing new ‘internal’ questions and in answering them, discovering new methods that can be used in applications. On the other hand, it is influenced by questions from PDEs and stochastic processes as well as from applied sciences such as mathematical biology and optimal control, and thus it continually gathers a new momentum. Researchers and postgraduate students working in operator theory, partial differential equations, probability and stochastic processes, analytical methods in biology and other natural sciences, optimization and optimal control will find this volume useful.


Positive Semigroups of Operators, and Applications

Positive Semigroups of Operators, and Applications

Author: O. Bratteli

Publisher: Springer Science & Business Media

Published: 1984-08-31

Total Pages: 214

ISBN-13: 9789027718396

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This means that semigroup theory may be applied directly to the study of the equation I'!.f = h on M. In [45] Yau proves that, for h ~ 0, there are no nonconstant, nonnegative solutions f in [j' for 1


The Functional Calculus for Sectorial Operators

The Functional Calculus for Sectorial Operators

Author: Markus Haase

Publisher: Springer Science & Business Media

Published: 2006-08-18

Total Pages: 399

ISBN-13: 3764376988

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This book contains a systematic and partly axiomatic treatment of the holomorphic functional calculus for unbounded sectorial operators. The account is generic so that it can be used to construct and interrelate holomorphic functional calculi for other types of unbounded operators. Particularly, an elegant unified approach to holomorphic semigroups is obtained. The last chapter describes applications to PDE, evolution equations and approximation theory as well as the connection with harmonic analysis.


Perturbations of Positive Semigroups with Applications

Perturbations of Positive Semigroups with Applications

Author: Jacek Banasiak

Publisher: Springer Science & Business Media

Published: 2005-12-16

Total Pages: 464

ISBN-13: 9781852339937

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This book deals mainly with modelling systems that change with time. The evolution equations that it describes can be found in a number of application areas, such as kinetics, fragmentation theory and mathematical biology. This will be the first self-contained account of the area.


Semigroups of Operators: Theory and Applications

Semigroups of Operators: Theory and Applications

Author: A.V. Balakrishnan

Publisher: Springer Science & Business Media

Published: 2000-08-01

Total Pages: 386

ISBN-13: 9783764363109

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These Proceedings comprise the bulk of the papers presented at the Inter national Conference on Semigroups of Opemtors: Theory and Contro~ held 14-18 December 1998, Newport Beach, California, U.S.A. The intent of the Conference was to highlight recent advances in the the ory of Semigroups of Operators which provides the abstract framework for the time-domain solutions of time-invariant boundary-value/initial-value problems of partial differential equations. There is of course a firewall between the ab stract theory and the applications and one of the Conference aims was to bring together both in the hope that it may be of value to both communities. In these days when all scientific activity is judged by its value on "dot com" it is not surprising that mathematical analysis that holds no promise of an immediate commercial product-line, or even a software tool-box, is not high in research priority. We are particularly pleased therefore that the National Science Foundation provided generous financial support without which this Conference would have been impossible to organize. Our special thanks to Dr. Kishan Baheti, Program Manager.