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 36
... continuous in II + y . We denote by [ u ] = u " ( ( y ) , y ) -u ' ( p ( y ) , y ) the jump of u at a point ( p ( y ) ... continuous along y , and thus 0 = O = [ ux ] o ' + [ u ] . ( 2.2 ) ( 2.3 ) ( 2.4 ) We consider now the case where u ...
... continuous in II + y . We denote by [ u ] = u " ( ( y ) , y ) -u ' ( p ( y ) , y ) the jump of u at a point ( p ( y ) ... continuous along y , and thus 0 = O = [ ux ] o ' + [ u ] . ( 2.2 ) ( 2.3 ) ( 2.4 ) We consider now the case where u ...
Página 213
... continuous on a closed interval [ a , b ] can be approximated uniformly by polynomials . [ Hint : Define f ( x ) = f ( b ) for x > b , f ( x ) = f ( a ) for x < a . Then u ( x , t ) → f ( x ) for t O uniformly for a < x < b , since u ...
... continuous on a closed interval [ a , b ] can be approximated uniformly by polynomials . [ Hint : Define f ( x ) = f ( b ) for x > b , f ( x ) = f ( a ) for x < a . Then u ( x , t ) → f ( x ) for t O uniformly for a < x < b , since u ...
Página 243
... continuous in CS ( ) = set of ƒ with continuous derivatives of orders < s in Co ( Ñ ) √ C3 ( Nint ) = set of ƒ continuous in the closure of N and with continu- ous derivatives or orders < s in the interior . Co ( ) = set of ƒ with ...
... continuous in CS ( ) = set of ƒ with continuous derivatives of orders < s in Co ( Ñ ) √ C3 ( Nint ) = set of ƒ continuous in the closure of N and with continu- ous derivatives or orders < s in the interior . Co ( ) = set of ƒ with ...
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