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On closed boundary value problems for equations of mixed elliptic‐hyperbolic type
Author(s) -
Lupo Daniela,
Morawetz Cathleen S.,
Payne Kevin R.
Publication year - 2007
Publication title -
communications on pure and applied mathematics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.12
H-Index - 115
eISSN - 1097-0312
pISSN - 0010-3640
DOI - 10.1002/cpa.20169
Subject(s) - mathematics , overdetermined system , uniqueness , mathematical analysis , boundary value problem , type (biology) , dirichlet problem , sobolev space , partial differential equation , elliptic boundary value problem , dirichlet distribution , free boundary problem , ecology , biology
For partial differential equations of mixed elliptic‐hyperbolic type we prove results on existence and existence with uniqueness of weak solutions for closed boundary value problems of Dirichlet and mixed Dirichlet‐conormal types. Such problems are of interest for applications to transonic flow and are overdetermined for solutions with classical regularity. The method employed consists in variants of the a − b − c integral method of Friedrichs in Sobolev spaces with suitable weights. Particular attention is paid to the problem of attaining results with a minimum of restrictions on the boundary geometry and the form of the type change function. In addition, interior regularity results are also given in the important special case of the Tricomi equation. © 2006 Wiley Periodicals, Inc.