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 69
Fritz John. This implies ( 3.18b ) . Since functions are real analytic , if they belong to some class CM ,, uni- formly for all points in a neighborhood of a given point , we have immediately : Theorem . If f ( x ) and g ( u ) are real ...
Fritz John. This implies ( 3.18b ) . Since functions are real analytic , if they belong to some class CM ,, uni- formly for all points in a neighborhood of a given point , we have immediately : Theorem . If f ( x ) and g ( u ) are real ...
Página 73
Fritz John. Show that u is the real part of an analytic function of ( y1 + iz1 , y2 + iz2 ) . [ Hint : find v from its differential du in terms of derivatives of u . ] 3 ... Real Analytic Functions and the Cauchy - Kowalevski Theorem 73.
Fritz John. Show that u is the real part of an analytic function of ( y1 + iz1 , y2 + iz2 ) . [ Hint : find v from its differential du in terms of derivatives of u . ] 3 ... Real Analytic Functions and the Cauchy - Kowalevski Theorem 73.
Página 98
... real analytic in 2. To see this we only have to continue u suitably into a complex neighborhood . We observe that K ... real points on a and έ to complex points in a sufficiently small complex neighborhood of a real point of . Formula ...
... real analytic in 2. To see this we only have to continue u suitably into a complex neighborhood . We observe that K ... real points on a and έ to complex points in a sufficiently small complex neighborhood of a real point of . Formula ...
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