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Multiply connected minimal surfaces of genus 0 with only simple interior branch points, for which the corresponding boundary value problem $$\Delta h - K|x_z |^2 h = 0; h_{|\partial \Omega } = 0$$ (K is the Gauss curvature and xz is the complex gradient of the surface x) is uniquely solvable and which have the property, that the condition K|xz|2≠0 holds in the branch points, are always isolated and stable solutions of the Plateau problem, corresponding to their boundary curves. To achieve these results one has to consider the conformal type as a variable. We give a method to perform the variation of the conformal type for holomorphic functions. Using the Weierstrass representation we thus obtain a differentiable structure on the set of multiply connected minimal surfaces. We find interesting connections between the classical Riemann-Hilbert problem and Fredholm properties of a projection operator on this manifold.  相似文献   

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Ohne Zusammenfassung Reinhold Baer zum 60. Geburtstag  相似文献   

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Let the orientated line of the three-dimensional moving space , trace out a closed ruled surface in the fixed space and let us consider an integral invariant the aperture distance of an orthogonal trajectory of its generators. Then the locus of lines with a given is a cyclic quadratic complex, which reduces to a linear complex in the case =0. Furthermore in this paper some line-geometric Holditch-theorems due toS. Hentschke [6],L. Hering [7] andJ. Hoschek [9], are generalized.  相似文献   

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Ohne Zusammenfassung  相似文献   

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Let M be a Riemannian manifold, a differentiable form on M with values in a bundle Hom (TM, ), and let G be an open subset of M such that Ker forms a vector bundle of constant fibre dimension k>0 over G. We prove: If satisfies some analytical conditions, then is completely integrable, the integral manifolds of are spherically bent in M, and in some interesting cases they are complete.  相似文献   

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We consider generalized ruled surfaces in euclidean n-space n with k-dimensional generators and central ruled surface of dimension k–m+1 (O < m < k). Every orthogonal trajectoryy of the generators of defines a principal ruled surface y with generators totally orthogonal to the generators of . In each generator of y there exists an ellipsoid — called the indicatrix of the distribution parameters — which is defined by the distribution parameters of the tangent spaces to or y. Formulars will be given for the distribution parameters of and y .

Herrn Prof. Dr. H.R. Müller zum 70. Geburtstag  相似文献   

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Ohne Zusammenfassung  相似文献   

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Ohne ZusammenfassungHerrnWilhelm Süss zum 60. Geburtstag am 7. März 1955 gewidmet.HerrnG. Bol habe ich für sein großes Interesse an den vorliegenden Untersuchungen zu danken Verschiedene Zusammenhänge und Ergebnisse gehen auf ihn zurück. Weitere Ergebnisse finden sich in seiner Projektiven Differentialgeometrie, Teil 3 (im Erscheinen).Über die Grundgedanken dieser Arbeit habe ieh auf der Tagung der Deutschen Mathematikervereinigung in München 1952 berichtet.  相似文献   

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Ohne Zusammenfassung Meinem verehrten Kollegen M. Plancherel zum siebzigsten Geburtstag  相似文献   

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Summary A versatile pulse counter arrangement for nuclear radiation measurements is described. It consists of ten binary scalers (one E90CC tube per channel, deadtime 1·5 s), ten commercial decade plug-in units (one E1T+E90CC, deadtime 27 s), and ten mechanical registers (driven by one E90CC, 20 counts/s). The binary scalers accept negative pulses (10 V, rise <0·5 s, decay >1 s) and serve as fast input scaling stages; they are designed to produce output pulses of the special shape required for triggering the subsequent decade stages.If all decade units are used singly, this equipment permits to count pulses in ten independent channels at a maximum rate of 400/s with negligible losses. On the other hand, one or several decade pairs can be made to work as scale-of-200's, so that up to 4000 pulses/s/channel can be measured with counting losses 1%.In cases where only 5 independent channels are needed, a switch common to all channels eliminates the dead-time otherwise required for reading out the counting results. This is done by alternative switching between even and odd registers, and in those channels which are connected as scale-of-20's, also the corresponding decade units are stopped and can be read whilst the other group of channels is working. This feature has proved especially helpful in investigations on the scintillation spectra of short-lived radioisotopes.The power supply has been constructed without using an anode voltage transformer, so that the whole apparatus is small and relatively light weighted.  相似文献   

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Ohne ZusammenfassungProf. G. Pickert anlälich seiner Emeritierung gewidmet.  相似文献   

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Ohne Zusammenfassung Reinhold Baer zum 60. Geburtstag Zusatz bei der Korrektur: Nachträglich bemerke ich, da\ C.Chevalley in seinem Buch Theory of Lie Groups (Princeton 1946) auf S. 94–98 die Frage der Abzählbarkeit in unserem Sinne bei analytischen Mannigfaltigkeiten mit analytischen Blätterungen behandelt hat.  相似文献   

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