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Ohne ZusammenfassungDiese Arbeit ist unter Contract N onr - 710(16) zwischen der Universität von Minnesota und dem Office of Naval Research vorbereitet worden.  相似文献   

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Ohne ZusammenfassungDiese Arbeit ist unter Contract N onr - 710(16) zwischen der Universität von Minnesota und dem Office of Naval Research vorbereitet worden.  相似文献   

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Riassunto Suggerito da discrepanze evidenti fra esperimento e calcolo, e ben sapendo che esse provengono, in parte, da fenomeni di anisotropia, si cominciano a correggere sistematicamente le teorie con dei supplementi anisotropici. Per questo, le Note, piccole o ampie, che si occupano di problemi di anisotropia, meritano attenzione.
Résumé Suggéré par d'évidentes discrépances entre expériment et calcul, et sachant bien qu'il proviennent, en partie, de phénomènes d'anisotropie, l'on commence à corriger systématiquement les théories par des suppléments anisotropiques. C'est pourquoi des notes, petites ou larges, qui s'occupent de problèmes d'anisotropie, méritent d'attention.
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We consider arithmetic properties of the solution of a functional equation f(qx)=xf(x)+1, where q0 is a rational number satisfying certain conditions. A linear independence measure is obtained for the values of f and its derivatives at rational points, both in the archimedian and p-adic case. The proof uses a refinement of the method followed by skolem in the corresponding qualitative considerations.

Diese Arbeit entstand während der erste Autor Stipendiat der Alexander von Humboldt-Stiftung war.  相似文献   

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Ohne ZusammenfassungDissertation, Universität Berlin, 1931.  相似文献   

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Ohne ZusammenfassungVerfasser hat über Ergebnisse und Methoden der vorliegenden Abhandlung auf der Naturforscherversammlung in Hamburg am 18. September 1928 ausführlich berichtet. Vgl. Jahresber. der D. Math.-V.38 (1929), S. 1–2.  相似文献   

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Suppose o is a Jordan curve in 3, bounding a minimal surface fo, and r a homotopy of o. Sometimes it will happen, that there is a uniquely determined homotopy fr of minimal surfaces, having r as boundary curve. But there may also be a bifurcation at o, in which, for instance, two or more different minimal surfaces are bounded by r for r0, but all those surfaces converge to fo as r converges to 0. In this paper we investigate minimal surfaces of the type of a disc, being represented by the Weierstra formula, and we consider small perturbations of the boundary curve o. We then deduce conditions, under which the bifurcation process of fo can be described in terms of the fold-, cusp- or swallowtail- catastrophe of Thom's celebrated list of the 7 elementary catastrophes. This will be possible, although the perturbation takes place in an infinite-dimensional space.  相似文献   

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Ohne Zusammenfassung  相似文献   

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Assume that x is a minimal surface in 3 of the topological type of a 2-ball. Then x is a critical point of the Dirichlet functional on a certain Banach manifold. We can define the space of Jacobi fields of x as the nullspace of the Hessian of at x. Let n(x) denote the dimension of this space and let (x) denote the total number of branch points of x. We show, that always n(x)2(x)+3, and that for almost all minimal surfaces equality holds. We can conclude, that all solutions of the classical Plateau problem, which have branch points in the interior and no branch points on the boundary, are degenerate critical points of the functional .  相似文献   

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