192,536 research outputs found
Malerische Beschreibung einzelner Gegenden des Riesen-Gebirges
No full textVorlage des Erscheinungsvermerks: Landeshut, gedruckt bei J. C. Neumann.8 Ill. (Kupferst.
Malerische Beschreibung einzelner Gegenden des Riesen-Gebirges / Herausgegeben von Tittel und Mattis, in Schmiedeberg
No full textVorlageform der Veröffentlichungsangabe: Landeshut, gedruckt bei J. C. Neumann
Wanderung im Riesen-Gebürge : malerisch erläutert und durch 27 in Contour radirte Kupfer abbildend dargestellt nebst einer Hauptansicht des Riesengebürges, mit Erklärungen versehen / [Verf.: Pastor Heyne]. Herausgegeben von Friedrich August Tittel, und Carl Mattis, in Schmiedeberg
No full textVorlage des Erscheinungsvermerks: Landeshut 1821, gedruckt bei J. C. Neumann.28 Ill. (Kupferst.
Stonsdorf, Erdmannsdorf, und Buchwald, in einer Reihe von 17 in Contour radirten Kupfern
No full textVorlage des Erscheinungsvermerks: Landeshut, gedruckt bei J. C. Neumann. - Erscheinungsjahr nach Angaben im Text17 Ill. (Kupferst.
Kochen-Specker theorem for von Neumann algebras
No full textThe Kochen-Specker theorem has been discussed intensely ever since its original proof in 1967. It is one of the central no-go theorems of quantum theory, showing the non-existence of a certain kind of hidden states models. In this paper, we first offer a new, non-combinatorial proof for quantum systems with a type I_n factor as algebra of observables, including I_infinity. Afterwards, we give a proof of the Kochen-Specker theorem for an arbitrary von Neumann algebra R without summands of types I_1 and I_2, using a known result on two-valued measures on the projection lattice P(R). Some connections with presheaf formulations as proposed by Isham and Butterfield are made
A comparison of deflation and the balancing Neumann-Neumann preconditioner
No full textIn this paper we compare various preconditioners for the numerical solution of partial differential equations. We compare the well-known balancing Neumann Neumann preconditioner used in domain decomposition methods with a so-called deflation preconditioner. We prove that the effective condition number of the deflated preconditioned system is always, i.e. for all deflation vectors and all restrictions and prolongations, below the condition number of the system preconditioned by the balancing Neumann-Neumann preconditioner. Even more, we establish that both preconditioners lead to almost the same spectra. The zero eigenvalues of the deflation preconditioned system are replaced by eigenvalues which are one if the balancing Neumann-Neumann preconditioner is used. Moreover, we proved that the A-norm of the errors of the iterates build by the deflation preconditioner is always below the A-norm of the errors of the iterates build by the balancing Neumann-Neumann preconditioner. Additionally, the amount of work of one iteration of the de ation preconditioned system is less than the amount of work of one iteration of the balancing Neumann-Neumann preconditioned system. Finally, we establish that the deflation preconditioner and the balancing Neumann-Neumann preconditioner produces the same iterates if one uses certain starting vectors. Numerical results for porous media flows emphasize the theoretical results.Electrical Engineering, Mathematics and Computer Scienc
Parentation Wie sie, Auf allergnädigsten Befehl, Bey einer sehr Volckreichen Versammlung gehalten worden, Von Seiner Königl. Majestät. Allerdmüthigsten Knecht D. F. Als man den, am 11. Aprilis 1731. Zu Potsdam verstorbenen, Freyherrn von Gundling, Sr. Königl. Majestät von Preussen Geheimten Rath [et]c. Den Tag nach seinem seeligen Abscheiden von der Welt, mit einer ansehnlichen und höchst-rühmlichen Leich-Procession, hinaus nach Bornstädt/ nahe bey Potsdam gelegen, gebracht, und alda in der Kirche beerdiget.
No full textD. F. ist David FassmannSignaturformel nach Ex. der GWLB Hannover: A6 [A2 statt A3]Vorlageform des Erscheinungsvermerks: Potsdam, gedruckt bey B. Neumann, Königl Preuß. privil. Hof-Buchdrucker und Buchhändler
Three nontrivial solutions for the p-Laplacian Neumann problems with a concave nonlinearity near the origin
Get PDFWe consider a nonlinear Neumann problem driven by the p-
Laplacian, with a right-hand side nonlinearity which is concave near the
origin. Using variational techniques, combined with the method of upper-lower
solutions and with Morse theory, we show that the problem has at least three
nontrivial smooth solutions, two of which have a constant sign (one positive
and one negative).FCTPOCI/MAT/55524/200
The von Neumann Model and the Early Models of General Equilibrium
No full textThe paper reconstructs the von Neumann model, comments on its salient features and critically reviews some of its generalisations. The issues related to thetreatment of consumption, decomposability and uniqueness of the rate of growth and interest will be especially scrutinised. The most prominent models of general equilibrium that appeared before or roughly at the same time as von Neumann's model will be also reviewed in the paper and compared with it. It will be demonstrated that none of them had any noticeable influence on von Neumann's model, which is genuinely distinct, ideologically free and methodologically fresh and forward-looking. It will be argued that the model can be viewed as a brilliant mathematical metaphor of some deep-rooted old vision, pertaining to the core issues of commodity production
Some rigidity aspects in von Neumann algebras and C*-algebras arising from groups
No full textIn the first part of my talk I will discuss the problems of reconstructing a countable discrete group from its von Neumann algebra (W*-superrigidity) and its reduced C*-algebra (C*-superrigidity) and I will survey several recent results in this direction.
In the second part, using and interplay between von Neumann algebraic and C*-algebraic methods, I will introduce a new class of C*-superrigid groups which appear as wreath products with non-amenable core. As an application we obtain complete calculations of the symmetry groups of various group C*-algebras---a problem barely touched in the literature. This is based on a recent joint work with Alec Diaz-Arias.Non UBCUnreviewedAuthor affiliation: University of IowaResearche
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