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| Autor(en): | Dian K. Palagachev; Lutz Recke; Lubomira G. Softova | Titel: | Applications of Differential Calculus to Nonlinear Elliptic Boundary Value Problems with Discontinuous Coefficients |
| Erscheinungsjahr: | 2004 |
| Erschienen in: |
Preprints aus dem Institut für Mathematik 21 (Mathematik-Preprints) ISSN: 0863-0976 |
| Volltext: | pdf (urn:nbn:de:kobv:11-10052278) |
| Fachgebiet(e): | Mathematik |
| Schlagwörter (eng): | Implicit function theorems, Nonlinear boundary value problems for linear elliptic PDE, boundary value problems for nonlinear elliptic PDE, PDE with discontinuous coefficients or data, global Newton methods |
| Herausgeber: | Humboldt-Universität zu Berlin, Mathematisch-Naturwissenschaftliche Fakultät II, Institut für Mathematik |
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| We deal with Dirichlet's problem for second order quasilinear non-divergence form elliptic equations with discontinuous coefficients. First we state suitable structure, growth, and regularity conditions ensuring solvability of the problem under consideration. Then we fix a solution $u_0$ such that the linearized in $u_0$ problem is non-degenerate, and we apply the Implicit Function Theorem: For all small perturbations of the coefficient functions there exists exactly one solution $u \approx u_0,$ and $u$ depends smoothly (in $W^{2,p}$ with $p$ larger than the space dimension) on the data. For that no structure and growth conditions are needed, and the perturbations of the coefficient functions can be general $L^\infty$-functions with respect to the space variable $x$. Moreover we show that the Newton Iteration Procedure can be applied to calculate a sequence of approximate (in $W^{2,p}$ again) solutions for $u_0.$ | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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