To the theory of boundary value problems for hyperbolic type equations and systems.
Gvazava, J., Kharibegashvili, S. (1997)
Memoirs on Differential Equations and Mathematical Physics
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Gvazava, J., Kharibegashvili, S. (1997)
Memoirs on Differential Equations and Mathematical Physics
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Matthias Eller (2008)
Applicationes Mathematicae
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Symmetric hyperbolic systems with a class of non-homogeneous boundary conditions that do not satisfy the Kreiss-Sakamoto condition (or uniform Lopatinskii condition) are discussed. The boundary conditions are of conservative type. An energy estimate which provides interior and boundary regularity for weak solutions to the system is proved. The results are valid for operators with rough coefficients. As an example the anisotropic Maxwell system is considered.
Andrzej Borzymowski (1998)
Mathematica Slovaca
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G. Eskin (1979-1980)
Séminaire Équations aux dérivées partielles (Polytechnique)
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Henderson, Johnny (2009)
Electronic Journal of Qualitative Theory of Differential Equations [electronic only]
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P. Ch. Tsamatos (2004)
Annales Polonici Mathematici
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We study a nonlocal boundary value problem for the equation x''(t) + f(t,x(t),x'(t)) = 0, t ∈ [0,1]. By applying fixed point theorems on appropriate cones, we prove that this boundary value problem admits positive solutions with slope in a given annulus. It is remarkable that we do not assume f≥0. Here the sign of the function f may change.
Arnold, Douglas N., Tarfulea, Nicolae (2007)
Electronic Journal of Differential Equations (EJDE) [electronic only]
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M. Greguš (1974)
Annales Polonici Mathematici
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Maroun, Mariette (2007)
Electronic Journal of Qualitative Theory of Differential Equations [electronic only]
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Jan Popiołek (1997)
Annales Polonici Mathematici
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We prove the existence of solutions of some boundary-value problems for partial differential equations of order higher than two. The general idea is similar to that in [1]. We make an essential use of the results of our paper [12].
Józef Wenety Myjak (1973)
Annales Polonici Mathematici
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