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

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Brugesser and Mani proved that the boundary-complex of a convex polytope can be shelled. This result lead to McMullen's proof of the Upper-bound-conjecture. We show that the shellability of complexes has a close connection to the theory of stellar operations. Several results on special shelling procedures and on non-shellable complexes are obtained.  相似文献   

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We are studying complete and B-complete topological vector groups. These Objects have been introduced by P. Kenderov [6] and D. A. Raikov [11]. They form a category TVG intermediate to the categories of topological Abelian groups and topological vector spaces and are close enough to the last one to give many useful applications to it. We first consider the problem of completion in the most used subcategories of TVG. A special functor allows to play back permanence property questions of completeness in locally convex vector groups to the same questions for locally convex vector spaces. Some examples of complete locally convex vector groups follow. We then unify some differently defined notions of B-completeness and generalize well known theorems concerning B-complete locally convex topological vector spaces to locally convex topological vector groups. Barrelledness concepts introduced in 9 and a special functor constructed in section 6 are used to formulate analogues of the closed graph and open mapping theorem for locally convex vector groups. The remainder of the note is left for applications to locally convex vector spaces. Many theorems about 1p-sums of normed spaces are proved, as well as the B-completeness of a vast class of locally convex vector spaces including the spaces and of Köthe ([7], §13, No 5,6).  相似文献   

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Zusammenfassung Bei unterjährigen Zahlungen gibt es i.w. zwei Möglichkeiten, die anfallenden Effektivzinsen zu kapitalisieren: zum einen die jährliche Gutschrift analog dem normalen Sparkonto und zum andern die Kapitalisierung nur zu Zahlungszeitpunkten. Beide Arten der Effektivzinsdefinition haben sich in der Praxis durchgesetzt; bei Darlehen überwiegt größtenteils die erstere und ist in der BRD z.T. sogar gesetzlich vorgeschrieben, bei Wertpapieren dominiert weitgehend die zweite. Die Vorzüge, Nachteile und Unterschiede beider Methoden werden dargestellt. Ausgehend vom Prinzip der äquivalenz von Sparbuchverzinsung und Endwertbzw. Barwertberechnung wird die zweckmäßige Definition des Barwertes bei jährlicher Effektivzinsverrechnung diskutiert. Schließlich wird ein praktisches Beispiel für die Grenzen des Effektivzinses als Entscheidungskriterium bei Finanzinvestitionen kurz erörtert und ein geraffter überblick über in der Praxis verwendete Tabellenwerke und Programme zur Ermittlung des Effektivzinses gegeben.
Summary In the main there exist two ways of capitalizing the profits of the effective interest rate if there is more than one payment a year. Firstly one capitalizes these net yields once a year by analogy with the usual savings account and secondly, one capitalizes them with each payment. Both definitions of the effective interest rate are in practical use in the FRG; the former is used mostly with loans and the latter with bonds. The advantages, disadvantages and differences of the two methods will be described. The definition of the present value is discussed for both methods based upon the equivalency of calculating the present value and computing the final amount of a savings account. Then a realistic example of a financial investment shows some restrictions for the effective interest rate and finally some practically used tables and programmes for calculating it are presented.
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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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