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 72
... functions F ( x ) corresponding to y = y1 , .. y1 , ... , y , ( denoted by F1 , convex sets ‚ F " ) uniquely define an analytic function F ( x ) in the set U. For if the Σx - l < r and Σlxx - ykl < r yil k k ( 3.26b ) in C " have a non ...
... functions F ( x ) corresponding to y = y1 , .. y1 , ... , y , ( denoted by F1 , convex sets ‚ F " ) uniquely define an analytic function F ( x ) in the set U. For if the Σx - l < r and Σlxx - ykl < r yil k k ( 3.26b ) in C " have a non ...
Página 89
... function for different weights w . We associate with the scalar point function f ( x ) the functional f [ • ] = f ( x ) f ( x ) dx , ( 6.4 ) where & ЄD = Co ( ) is the space of " test functions , " that is , functions having derivatives ...
... function for different weights w . We associate with the scalar point function f ( x ) the functional f [ • ] = f ( x ) f ( x ) dx , ( 6.4 ) where & ЄD = Co ( ) is the space of " test functions , " that is , functions having derivatives ...
Página 110
... function f . Then the u converge uniformly in to a continuous function u by the maximum principle . In any compact subset w of N for a fixed multi - index a the derivatives Du converge uniformly to Du . Hence uЄ C °° ( N ) and Au = 0 ...
... function f . Then the u converge uniformly in to a continuous function u by the maximum principle . In any compact subset w of N for a fixed multi - index a the derivatives Du converge uniformly to Du . Hence uЄ C °° ( N ) and Au = 0 ...
Contenido
Chapter | 1 |
Quasilinear Equations | 9 |
The Cauchy Problem | 24 |
Derechos de autor | |
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Términos y frases comunes
assume ball boundary bounded uniformly Cauchy data Cauchy problem Cauchy sequence Cauchy-Kowalevski Chapter characteristic curves class C² coefficients compact support complex constant continuous converge defined denote derivatives of orders determined uniquely difference quotients Dirichlet problem domain of dependence elliptic exists follows formula Fourier function f(x fundamental solution Gårding given Green's identity heat equation hence Hint holds identity implies inequality initial data initial values initial-value problem integral surface Laplace equation Lemma linear matrix neighborhood non-characteristic norm obtained open set partial differential equation plane polynomial power series prescribed proof quasi-linear real numbers satisfies scalar second derivatives Show solved space square integrable sufficiently small test functions theorem u₁ vanish variables vector wave equation x₁ ΘΩ