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Ohne ZusammenfassungHerrn Professor Dr.Ernst Hölder zum 65. Geburtstag gewidmet  相似文献   

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Strongly elliptic systems of nonlinear partial differential equations are considered in the case when the derivatives of the solutions occuring in the nonlinear terms have the same order as those in the linear principal part. The existence of periodic solutions for such systems is investigated. It is shown that this problem can be reduced to the study of algebraic bifurcation equations, whose small solutions correspond to the classical solutions of the given problem. A discussion of the bifurcation equations will be given in a forthcoming paper.  相似文献   

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Semilinear equations of Boussinesq type, e.g. utt + uxx ? uxxxx + (u2)xx = 0, utt + uxx ? uxxxx + uxuxx = 0, or certain equations containing the squared wave operator, e.g. uxxtt ? uk = 0, k ? N k ≥ 2, are studied. A generalized boundary value problem on bounded domains can be treated using Hilbert space methods. The linear parts of these equations are not elliptic, the latter not even hypoelliptic. A mountain pass lemma is used to prove the existence of nontrivial weak solutions. These solutions are obtained in anisotropic Sobolev spaces.  相似文献   

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Ohne ZusammenfassungHerrnHermann Schmidt zum 60. Geburtstag gewidmet  相似文献   

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Ohne ZusammenfassungHerrnF. Pfeiffer zum 60. Geburtstag gewidmet.  相似文献   

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