Partial Differential EquationsSpringer, 1982 - 249 páginas This book is a very well-accepted introduction to the subject. In it, the author identifies the significant aspects of the theory and explores them with a limited amount of machinery from mathematical analysis. Now, in this fourth edition, the book has again been updated with an additional chapter on Lewy 's example of a linear equation without solutions. |
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Página 107
... given boundary values u = ƒ on a formula ( 3.7 ) solves the Dirichlet problem , provided that problem has a solution uЄC2 ( ) . We shall verify directly that for ƒ continuous on a the problem actually has a solution given by Poisson's ...
... given boundary values u = ƒ on a formula ( 3.7 ) solves the Dirichlet problem , provided that problem has a solution uЄC2 ( ) . We shall verify directly that for ƒ continuous on a the problem actually has a solution given by Poisson's ...
Página 160
... given by ( 2.31 ) . u ( x , t ) = eix.Z ( ¿ , t ) im - 1 ( 2.75b ) ( 2.75c ) We now restrict ourselves to the case that P is strictly hyperbolic , that is , that all roots of the homogeneous equation are real and distinct for $ 0 . In ...
... given by ( 2.31 ) . u ( x , t ) = eix.Z ( ¿ , t ) im - 1 ( 2.75b ) ( 2.75c ) We now restrict ourselves to the case that P is strictly hyperbolic , that is , that all roots of the homogeneous equation are real and distinct for $ 0 . In ...
Página 213
... given by Χ u ( x , 1 ) = 1+ √4t where ( s ) is the " error function " 2 $ ( s ) = ντ Se dt . ( 1.27a ) ( 1.27b ) 6. Show that for f ( x ) continuous and of compact support we have lim , → ∞u ( x , t ) = O uniformly in x for the u given ...
... given by Χ u ( x , 1 ) = 1+ √4t where ( s ) is the " error function " 2 $ ( s ) = ντ Se dt . ( 1.27a ) ( 1.27b ) 6. Show that for f ( x ) continuous and of compact support we have lim , → ∞u ( x , t ) = O uniformly in x for the u given ...
Contenido
Chapter | 1 |
Examples | 2 |
Analytic Solution and Approximation Methods in a Simple Example Problems 4 Quasilinear Equations | 4 |
Derechos de autor | |
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analytic functions assume ball boundary bounded uniformly Cauchy data Cauchy problem Cauchy sequence Chapter characteristic curves class C² coefficients compact support complex constant continuous converge defined denote derivatives of orders difference quotients Dirichlet problem domain of dependence elliptic exists follows formula Fourier function f fundamental solution Gårding Gårding's inequality given harmonic function heat equation hence Hint Ho(N holds identity implies inequality initial data initial values initial-value problem integral surface Laplace equation Lemma linear matrix maximum principle neighborhood non-characteristic norm obtained open set partial differential equation plane polynomial power series prescribed proof real analytic real numbers satisfies scalar Show solution u(x,t solved space square integrable sufficiently small test functions theorem u₁ vanish variables vector wave equation x₁ ΘΩ