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Ohne ZusammenfassungHerrnB. L. van der Waerden zum 60. Geburtstag am 2. 2. 1963 gewidmet  相似文献   

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Das nachstehende Referat gibt das Ergebnis einer Untersuchung wieder, die der Arbeitskreis ?Methoden zur Schätzung der Prämienreserven“ im Auftrage des Ausschusses für Betriebstechnik des Verbandes der Lebensversicherungsunternehmen angestellt hat. Es erscheint gleichzeitig als 9. Folge der Schriftenreihe ?Betriebstechnische Fragen der Lebensversicherung“; Herausgeber Verband der Lebensversicherungsunternehmen e.V., Bonn. Die Arbeiten wurden von den Herren C. Boehm, H. v. Denffer, K. Klingner, P. Leepin und F. Rueff durchgeführt.  相似文献   

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Generalizing results in [1], [3], [5], and [7] it is shown that the algebra generated by the quasi-regular representation of a discrete groupG onl 2 (G/H) satisfies a standard polynomial identity if and only if (G) contains an abelian normal subgroup of finite index. An analogon for topological groups is also proved.  相似文献   

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Summary The change of states of a closed thermodynamic system having two degrees of freedom can be expressed analytically by means of the isentropic and the isenthalpic exponents, suitably defined. By imposing certain plausible conditions on these exponents, it can be shown that many well-known formulae, originally derived for an ideal gas with constant specific heat, become applicable more generally. Low pressure wet steam of not too low dryness fraction as occurred in the low-pressure stages of condensing turbines obeys these imposed conditions fairly well.The problem of supersaturation and of the drift toward equilibrium has been briefly touched upon.  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 Herrn Prof. Dr. Willy Scherrer zu seinem 60. Geburtstag, am 29. Juli 1954, gewidmet  相似文献   

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Ohne ZusammenfassungMeinem verehrten Lehrer, Prof. Dr. Paul Finsler, zum sechzigsten Geburtstag gewidmet.  相似文献   

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