Generalized principal eigenvalue in unbounded domains and applications to nonlinear elliptic and parabolic problems PDF Download

Author: Luca Rossi
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Languages : it
Pages :

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Author: Luca Rossi
Publisher:
ISBN:
Category :
Languages : en
Pages : 188

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Cette thèse traite différents sujets de la théorie des équations aux dérivées partielles elliptiques et paraboliques. La partie centrale est dédiée à l'étude de la validité de théorèmes de type Liouville pour opérateurs elliptiques linéaires, semi linéaires et complètement non linéaires. Avec "théorèmes de type Liouville" on entend l'unicité (multiplication par une constante près dans le cas des équations linéaires) des solutions bornées (parfois positives) d'une équation elliptique dans un domaine non borné, en analogie avec le théorème classique pour fonctions harmoniques. Nous avons montré que le théorème de type Liouville est valable pour les opérateurs linéaires à coefficients périodiques dans tout l'espace et il n'est plus valable en générale si les coefficients sont seulement presque périodiques.Pour démontrer des théorèmes de Liouville pour des équations semi linéaires on a du introduire des notions qui généralisent celle de la valeur propre principale. Les définitions et l'étude des propriétés de ces valeurs propres principales généralisées font l'objet de la première partie de la thèse, qui est la plus abstraite. La partie regardante les équations elliptiques est conclue par des résultats d'unicité de solutions de viscosité non négatives pour une classe d'équations complètement non linéaires. Le dernier sujet traité dans la thèse est celui des équations de réaction diffusion et, en particulier, de l'étude du comportement des solutions à long terme. L'un des résultats présentés regarde des équations avec vitesse forcée, qui interviennent dans plusieurs modèles de mathématiques appliquées, notamment en écologie.

Author: M Nedeljkov
Publisher: CRC Press
ISBN: 9780582356832
Category : Mathematics
Languages : en
Pages : 172

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Results from the now-classical distribution theory involving convolution and Fourier transformation are extended to cater for Colombeau's generalized functions. Indications are given how these particular generalized functions can be used to investigate linear equations and pseudo differential operators. Furthermore, applications are also given to problems with nonregular data.

Author: Doina Cioranescu
Publisher: CRC Press
ISBN: 9780582369269
Category : Mathematics
Languages : en
Pages : 354

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This book presents the texts of selected lectures on recent work in the field of nonlinear partial differential equations delivered by leading international experts at the well-established weekly seminar held at the Collège de France. Emphasis is on applications to numerous areas, including control theory, theoretical physics, fluid and continuum mechanics, free boundary problems, dynamical systems, scientific computing, numerical analysis, and engineering. Proceedings of this seminar will be of particular interest to postgraduate students and specialists in the area of nonlinear partial differential equations.

Author: John Ryan
Publisher: CRC Press
ISBN: 9780582356818
Category : Mathematics
Languages : en
Pages : 260

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Clifford analysis has blossomed into an increasingly relevant and fashionable area of research in mathematical analysis-it fits conveniently at the crossroads of many fundamental areas of research, including classical harmonic analysis, operator theory, and boundary behavior. This book presents a state-of-the-art account of the most recent developments in the field of Clifford analysis with contributions by many of the field's leading researchers.

Author: John Roe
Publisher: CRC Press
ISBN: 1482247836
Category : Mathematics
Languages : en
Pages : 218

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Ten years after publication of the popular first edition of this volume, the index theorem continues to stand as a central result of modern mathematics-one of the most important foci for the interaction of topology, geometry, and analysis. Retaining its concise presentation but offering streamlined analyses and expanded coverage of important exampl

Author: T M Rassias
Publisher: CRC Press
ISBN: 9780582317116
Category : Mathematics
Languages : en
Pages : 284

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In this volume, the contributing authors deal primarily with the interaction among problems of analysis and geometry in the context of inner product spaces. They present new and old characterizations of inner product spaces among normed linear spaces and the use of such spaces in various research problems of pure and applied mathematics. The methods employed are accessible to students familiar with normed linear spaces. Some of the theorems presented are at the same time simple and challenging.

Author:
Publisher:
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Category : Geometry
Languages : en
Pages : 446

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Author: John Roe
Publisher: CRC Press
ISBN: 9780582325029
Category : Mathematics
Languages : en
Pages : 222

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Ten years after publication of the popular first edition of this volume, the index theorem continues to stand as a central result of modern mathematics-one of the most important foci for the interaction of topology, geometry, and analysis. Retaining its concise presentation but offering streamlined analyses and expanded coverage of important examples and applications, Elliptic Operators, Topology, and Asymptotic Methods, Second Edition introduces the ideas surrounding the heat equation proof of the Atiyah-Singer index theorem. The author builds towards proof of the Lefschetz formula and the full index theorem with four chapters of geometry, five chapters of analysis, and four chapters of topology. The topics addressed include Hodge theory, Weyl's theorem on the distribution of the eigenvalues of the Laplacian, the asymptotic expansion for the heat kernel, and the index theorem for Dirac-type operators using Getzler's direct method. As a "dessert," the final two chapters offer discussion of Witten's analytic approach to the Morse inequalities and the L2-index theorem of Atiyah for Galois coverings. The text assumes some background in differential geometry and functional analysis. With the partial differential equation theory developed within the text and the exercises in each chapter, Elliptic Operators, Topology, and Asymptotic Methods becomes the ideal vehicle for self-study or coursework. Mathematicians, researchers, and physicists working with index theory or supersymmetry will find it a concise but wide-ranging introduction to this important and intriguing field.

Author: Hartje Kriete
Publisher: CRC Press
ISBN: 9780582323889
Category : Mathematics
Languages : en
Pages : 204

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In the last few decades, complex dynamical systems have received widespread public attention and emerged as one of the most active fields of mathematical research. Starting where other monographs in the subject end, Progress in Holomorphic Dynamics advances the theoretical aspects and recent results in complex dynamical systems, with particular emphasis on Siegel discs. Organized into four parts, the papers in this volume grew out of three workshops: two hosted by the Georg-August-Universität Göttingen and one at the "Mathematisches Forschungsinstitut Oberwolfach." Part I addresses linearization. The authors review Yoccoz's proof that the Brjuno condition is the optimal condition for linearizability of indifferent fixed points and offer a treatment of Perez-Marco's refinement of Yoccoz's work. Part II discusses the conditions necessary for the boundary of a Siegel disc to contain a critical point, builds upon Herman's work, and offers a survey of the state-of-the-art regarding the boundaries of Siegel discs. Part III deals with the topology of Julia sets with Siegel discs and contains a remarkable highlight: C.L. Petersen establishes the existence of Siegel discs of quadratic polynomials with a locally connected boundary. Keller, taking a different approach, explains the relations between locally connected "real Julia sets" with Siegel discs and the abstract concepts of kneading sequences and itineraries. Part IV closes the volume with four papers that review the different directions of present research in iteration theory. It includes discussions on the relations between commuting rational functions and their Julia sets, interactions between the iteration of polynomials and the iteration theory of entire transcendental functions, a deep analysis of the topology of the limbs of the Mandelbrot set, and an overview of complex dynamics in higher dimensions.