Download or read book ESPACES DE BESOV ET PROPAGATION DES SINGULARITES DES SOLUTIONS NON BORNEES D EQUATIONS AUX DERIVEES PARTIELLES NON LINEAIRES written by Abdelkader Benmohamed and published by . This book was released on 1987 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: ETUDE DE LA PROPAGATION DES SINGULARITES MICROLOCALES DES SOLUTIONS D'EQUATIONS AUX DERIVEES PARTIELLES NON LINEAIRES, LORSQUE CES SOLUTIONS SONT NON BORNEES ET APPARTIENNENT A DES ESPACES DE BESOV.NOUS MONTRONS QUE LA COMPOSITION F(U) OU U APPARTIENT LOCALEMENT A DES ESPACES DE BESOV QUI NE SONT PAS DES ALGEBRES ET F APPARTIENT A UNE CERTAINE CLASSE DE FONCTIONS, EST LOCALEMENT DANS UN AUTRE ESPACE DE BESOV; ENSUITE, NOUS DEVELOPPONS UN CALCUL SYMBOLIQUE CONCERNANT LES OPERATEURS PARADIFFERENTIELS DONT LES SYMBOLES NE SONT, A PRIORI, PAS BORNES; CE QUI NOUS PERMETTRA PAR LA SUITE DE LINEARISER CES EQUATIONS AU SENS DE BONY ET DE MONTRER QUE L'ON PEUT OBTENIR DES RESULTATS DE PROPAGATION DES SINGULARITES MICROLOCALES DE CES SOLUTIONS

Download or read book Espaces de besov et propagation des singularites des solutions non bornees d equations aux derivees partielles non lineaires written by A. Benmohamed and published by . This book was released on 1989 with total page 57 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Espaces de Besov et propagation des singularit s des solutions non born es d quations aux deriv es partielles non lin aires written by Abdelkader Benmohamed and published by . This book was released on 1987 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Contributions l tude des singularit s des solutions des quations aux d riv es partielles non lin aires written by Éric Leichtnam and published by . This book was released on 1987 with total page 144 pages. Available in PDF, EPUB and Kindle. Book excerpt: Ce travail est composé de quatre articles.Dans le premier nous définissons de manière intrinsèque le concept de front d'onde d'une sous-variété de régularité Höldérienne ou Sobolev limitée. Puis nous utilisons cette notion pour étudier les singularités microlocales de solutions d'équations aux dérivées partielles non linéaires dans plusieurs situations: équations du premier ordre, de Monge-Ampère, système de Pfaff.Dans le second article, nous étudions le problème d'interaction des singularités pour un opérateur pseudodifférentiel à symbole principal réel et dont la variété caractéristique est la réunion de deux hyper surfaces lisses d'interaction non involutive.Dans le troisième article, nous construisons pour un opérateur quasi-linéaire holomorphe des solutions holomorphes ramifiées autour d'une hypersurface complexe lisse caractéristique.Dans le quatrième article, nous étudions la régularité microlocale des solutions des problèmes de Dirichlet non linéaires non caractéristiques d'ordre deux à bord peu régulier.

Download or read book FRONT D ONDE D UNE SOUS VARIETE written by Éric Leichtnam and published by . This book was released on 1984 with total page 234 pages. Available in PDF, EPUB and Kindle. Book excerpt: SI LES COMPOSANTES D'UN DIFFEOMORPHISME DE CLASSE H**(S) APPARTIENNENT MICROLOCALEMENT A H**(S)' EN (CHI ::(0), SIGMA ::(0)), IL EN EST DE MEME, AU POINT (Y::(0), ETA ::(0)) CORRESPONDANT, DES COMPOSANTES DU DIFFEOMORPHISME INVERSE, POURVU QUE S'

Download or read book tude de quelques probl mes elliptiques et paraboliques quasi lin aires avec singularit s written by Paul Sauvy and published by . This book was released on 2012 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Cette thèse s'inscrit dans le domaine mathématique de l'analyse des équations aux dérivées partielles non-linéaires. Plus précisément, nous avons fait ici l'étude de problèmes quasi-linéaires singuliers. Le terme "singulier" fait référence à l'intervention d'une non-linéarité qui explose au bord du domaine où 'équation est posée. La présence d'une telle singularité entraîne un manque de régularité et donc de compacité des solutions qui ne nous permet pas d'appliquer directement les méthodes classiques de l'analyse non-linéaire pour démontrer l'existence de solutions et discuter des propriétés de régularité et de comportement asymptotique de ces solutions. Pour contourner cette difficulté, nous sommes amenés à établir des estimations a priori très fines au voisinage du bord du domaine en combinant diverses méthodes : méthodes de monotonie (reliée au principe du maximum), méthodes variationnelles, argument de convexité, méthodes de point fixe et semi-discrétisation en temps. A travers, l'étude de trois problèmes-modèle faisant intervenir l'opérateur p-Laplacien, nous avons montré comment ces différentes méthodes pouvaient être mises en œuvre. Les résultats que nous avons obtenus sont décrits dans les trois chapitres de cette thèse : Dans le Chapitre I, nous avons étudié un problème d'absorption elliptique singulier. En utilisant des méthodes de sur- et sous solutions et des méthodes variationnelles, nous établissons des résultats d'existence de solutions. Par des méthodes de comparaison locale, nous démontrons également la propriété de support compact de ces solutions, pour de fortes singularités. Dans le Chapitre II, nous étudions le cas d'un système d'équations quasi-linéaires singulières. Par des arguments de point fixe et de monotonie, nous démontrons deux résultats généraux d'existence de solutions. Dans un deuxième temps, nous faisons une analyse plus détaillée de systèmes du type Gierer-Meinhardt modélisant des phénomènes biologiques. Des résultats d'unicité ainsi que des estimations précises sur le comportement des solutions sont alors obtenus. Dans le Chapitre III, nous faisons l'étude d'un problème d'absorption, parabolique singulier. Nous établissons par une méthode de semi-discrétisation en temps des résultats d'existence de solutions. Grâce à des inégalités d'énergie, nous démontrons également l'extinction en temps fini de ces solutions.

Download or read book Etude Qualitative de la Formation Des Singularit s Pour Certaines quations Aux D riv es Partielles Non Lin aires written by Christophe Antonini and published by . This book was released on 2001 with total page 186 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this thesis, I study two nonlinear evolution partial differential equations whose solutions may blow-up in finite time. In the first part, I consider the nonlinear Schrödinger equation with critical exponent in the space periodic case and obtain a lower bound for the blow-up rate under the condition of minimal mass. In parts 2 and 3, I study a semi-linear wave equation. In part 2 we obtain optimal bounds on the blow-up rate, and in part 3 I study the asymptotic behaviour to solutions of this equation.

Download or read book Advances in Mathematical Fluid Mechanics written by Josef Malek and published by Springer. This book was released on 2000-10-04 with total page 236 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book consists of six survey contributions that are focused on several open problems of theoretical fluid mechanics both for incompressible and compressible fluids. The first article "Viscous flows in Besov spaces" by M area Cannone ad dresses the problem of global existence of a uniquely defined solution to the three-dimensional Navier-Stokes equations for incompressible fluids. Among others the following topics are intensively treated in this contribution: (i) the systematic description of the spaces of initial conditions for which there exists a unique local (in time) solution or a unique global solution for small data, (ii) the existence of forward self-similar solutions, (iii) the relation of these results to Leray's weak solutions and backward self-similar solutions, (iv) the extension of the results to further nonlinear evolutionary problems. Particular attention is paid to the critical spaces that are invariant under the self-similar transform. For sufficiently small Reynolds numbers, the conditional stability in the sense of Lyapunov is also studied. The article is endowed by interesting personal and historical comments and an exhaustive bibliography that gives the reader a complete picture about available literature. The papers "The dynamical system approach to the Navier-Stokes equa tions for compressible fluids" by Eduard Feireisl, and "Asymptotic problems and compressible-incompressible limits" by Nader Masmoudi are devoted to the global (in time) properties of solutions to the Navier-Stokes equa and three tions for compressible fluids. The global (in time) analysis of two dimensional motions of compressible fluids were left open for many years.

Download or read book Singularities in Boundary Value Problems written by Pierre Grisvard and published by Springer. This book was released on 1992 with total page 224 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Conference on Applications of Numerical Analysis written by John Ll Morris and published by . This book was released on 1971 with total page 358 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Functional Analysis and Numerical Mathematics written by Lothar Collatz and published by Academic Press. This book was released on 2014-05-12 with total page 494 pages. Available in PDF, EPUB and Kindle. Book excerpt: Functional Analysis and Numerical Mathematics focuses on the structural changes which numerical analysis has undergone, including iterative methods, vectors, integral equations, matrices, and boundary value problems. The publication first examines the foundations of functional analysis and applications, including various types of spaces, convergence and completeness, operators in Hilbert spaces, vector and matrix norms, eigenvalue problems, and operators in pseudometric and other special spaces. The text then elaborates on iterative methods. Topics include the fixed-point theorem for a general iterative method in pseudometric spaces; special cases of the fixed-point theorem and change of operator; iterative methods for differential and integral equations; and systems of equations and difference methods. The manuscript takes a look at monotonicity, inequalities, and other topics, including monotone operators, applications of Schauder's theorem, matrices and boundary value problems of monotone kind, discrete Chebyshev approximation and exchange methods, and approximation of functions. The publication is a valuable source of data for mathematicians and researchers interested in functional analysis and numerical mathematics.

Download or read book Cones and Duality written by Charalambos D. Aliprantis and published by American Mathematical Soc.. This book was released on 2007-06-12 with total page 298 pages. Available in PDF, EPUB and Kindle. Book excerpt: Ordered vector spaces and cones made their debut in mathematics at the beginning of the twentieth century. They were developed in parallel (but from a different perspective) with functional analysis and operator theory. Before the 1950s, ordered vector spaces appeared in the literature in a fragmented way. Their systematic study began around the world after 1950 mainly through the efforts of the Russian, Japanese, German, and Dutch schools. Since cones are being employed to solve optimization problems, the theory of ordered vector spaces is an indispensable tool for solving a variety of applied problems appearing in several diverse areas, such as engineering, econometrics, and the social sciences. For this reason this theory plays a prominent role not only in functional analysis but also in a wide range of applications. This is a book about a modern perspective on cones and ordered vector spaces. It includes material that has not been presented earlier in a monograph or a textbook. With many exercises of varying degrees of difficulty, the book is suitable for graduate courses. Most of the new topics currently discussed in the book have their origins in problems from economics and finance. Therefore, the book will be valuable to any researcher and graduate student who works in mathematics, engineering, economics, finance, and any other field that uses optimization techniques.

Download or read book Inverse Eigenvalue Problems written by Moody Chu and published by Oxford University Press. This book was released on 2005-06-16 with total page 408 pages. Available in PDF, EPUB and Kindle. Book excerpt: Inverse eigenvalue problems arise in a remarkable variety of applications and associated with any inverse eigenvalue problem are two fundamental questions--the theoretical issue of solvability and the practical issue of computability. Both questions are difficult and challenging. In this text, the authors discuss the fundamental questions, some known results, many applications, mathematical properties, a variety of numerical techniques, as well as several open problems.This is the first book in the authoritative Numerical Mathematics and Scientific Computation series to cover numerical linear algebra, a broad area of numerical analysis. Authored by two world-renowned researchers, the book is aimed at graduates and researchers in applied mathematics, engineering and computer science and makes an ideal graduate text.

Download or read book Symbolic Dynamics and its Applications written by Peter Walters and published by American Mathematical Soc.. This book was released on 1992 with total page 472 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume contains the proceedings of the conference, Symbolic Dynamics and its Applications, held at Yale University in the summer of 1991 in honour of Roy L. Adler on his sixtieth birthday. The conference focused on symbolic dynamics and its applications to other fields, including: ergodic theory, smooth dynamical systems, information theory, automata theory, and statistical mechanics. Featuring a range of contributions from some of the leaders in the field, this volume presents an excellent overview of the subject.

Download or read book Studies in Linear and Non Linear Programming written by Leonid Hurwicz and published by . This book was released on 2012-07-01 with total page 242 pages. Available in PDF, EPUB and Kindle. Book excerpt: Additional Contributing Authors Include Thomas Marschak, Robert Solow, Samuel Karlin, And Others.

Download or read book Discrete and Computational Geometry written by Jacob E. Goodman and published by American Mathematical Soc.. This book was released on 1991-01-01 with total page 394 pages. Available in PDF, EPUB and Kindle. Book excerpt: The first DIMACS special year, held during 1989-1990, was devoted to discrete and computational geometry. More than 200 scientists, both long- and short-term visitors, came to DIMACS to participate in the special year activities. Among the highlights were six workshops at Rutgers and Princeton Universities that defined the focus for much of the special year. The workshops addressed the following topics: geometric complexity, probabilistic methods in discrete and computational geometry, polytopes and convex sets, arrangements, and algebraic and practical issues in geometric computation. This volume presents some of the results growing out of the workshops and the special year activities. Containing both survey articles and research papers, this collection presents an excellent overview of significant recent progress in discrete and computational geometry. The diversity of these papers demonstrate how geometry continues to provide a vital source of ideas in theoretical computer science and discrete mathematics as well as fertile ground for interaction and simulation between the two disciplines.

Download or read book Pseudo differential Operators and the Nash Moser Theorem written by Serge Alinhac and published by American Mathematical Soc.. This book was released on 2007 with total page 178 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book presents two essential and apparently unrelated subjects. The first, microlocal analysis and the theory of pseudo-differential operators, is a basic tool in the study of partial differential equations and in analysis on manifolds. The second, the Nash-Moser theorem, continues to be fundamentally important in geometry, dynamical systems and nonlinear PDE. Each of the subjects, which are of interest in their own right as well as for applications, can be learned separately. But the book shows the deep connections between the two themes, particularly in the middle part, which is devoted to Littlewood-Paley theory, dyadic analysis, and the paradifferential calculus and its application to interpolation inequalities. An important feature is the elementary and self-contained character of the text, to which many exercises and an introductory Chapter $0$ with basic material have been added. This makes the book readable by graduate students or researchers from one subject who are interested in becoming familiar with the other. It can also be used as a textbook for a graduate course on nonlinear PDE or geometry.