共查询到20条相似文献,搜索用时 15 毫秒
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Ulrich Staude 《Mathematische Annalen》1966,165(2):117-134
Ohne ZusammenfassungHerrn Professor Dr.Ernst Hölder zum 65. Geburtstag gewidmet 相似文献
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Ulrich Staude 《manuscripta mathematica》1971,5(3):251-274
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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Heinz König 《Archiv der Mathematik》1963,14(1):252-265
Ohne ZusammenfassungHerrnHermann Schmidt zum 60. Geburtstag gewidmet 相似文献
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E. Kamke 《Mathematische Zeitschrift》1943,49(1):256-284
Ohne ZusammenfassungHerrnF. Pfeiffer zum 60. Geburtstag gewidmet. 相似文献
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