Polyharmonic Boundary Value Problems*

Polyharmonic Boundary Value Problems*

AngličtinaMěkká vazbaTisk na objednávku
Gazzola Filippo
Springer-Verlag Berlin and Heidelberg GmbH & Co. KG
EAN: 9783642122446
Tisk na objednávku
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Podrobné informace

Linear elliptic equations arise in several models describing various phenomena in the applied sciences, the most famous being the second order stationary heat eq- tion or,equivalently,the membraneequation. Forthis intensivelywell-studiedlinear problem there are two main lines of results. The ?rst line consists of existence and regularity results. Usually the solution exists and "gains two orders of differen- ation" with respect to the source term. The second line contains comparison type results, namely the property that a positive source term implies that the solution is positive under suitable side constraints such as homogeneous Dirichlet bou- ary conditions. This property is often also called positivity preserving or, simply, maximum principle. These kinds of results hold for general second order elliptic problems, see the books by Gilbarg-Trudinger [198] and Protter-Weinberger [347]. For linear higher order elliptic problems the existence and regularitytype results - main, as one may say, in their full generality whereas comparison type results may fail. Here and in the sequel "higher order" means order at least four. Most interesting models, however, are nonlinear. By now, the theory of second order elliptic problems is quite well developed for semilinear, quasilinear and even for some fully nonlinear problems. If one looks closely at the tools being used in the proofs, then one ?nds that many results bene?t in some way from the positivity preserving property. Techniques based on Harnack's inequality, De Giorgi-Nash- Moser's iteration, viscosity solutions etc.
EAN 9783642122446
ISBN 3642122442
Typ produktu Měkká vazba
Vydavatel Springer-Verlag Berlin and Heidelberg GmbH & Co. KG
Datum vydání 3. června 2010
Stránky 423
Jazyk English
Rozměry 235 x 155
Země Germany
Autoři Gazzola Filippo; Grunau Hans-Christoph; Sweers Guido
Ilustrace XVIII, 423 p. 18 illus.
Edice 2010 ed.
Série Lecture Notes in Mathematics