62,929 research outputs found
Convergence of infinite products of matrices and inner-outer iteration schemes
No full textElsner L, Bru R, Neumann MM. Convergence of infinite products of matrices and inner-outer iteration schemes. Electronic Transactions on Numerical Analysis. 1994;2:183-193
Álgebras de von Neumann - fatores
No full textDissertação (mestrado) - Universidade Federal de Santa Catarina, Centro de Ciências Físicas e Matemáticas, Programa de Pós-Graduação em Matemática e Computação Científica, Florianópolis, 2011Dada uma álgebra de von Neumann M em L(H), onde L(H) é o espaço dos operadores lineares e limitados sobre um espaço de Hilbert H, dizemos que M é um fator se seu centro consiste somente por múltiplos escalares do operador identidade de L(H). Quando M é um fator, podemos classificá-lo em tipo I, II e III. Além disso, o tipo II pode ser dividido em dois sub-tipos. O objetivo dessa dissertação é exibir exemplos de fatores, bem como exemplos dos tipos I, II e seus sub-tipos
Equilibrio competitivo y soportes del crecimiento en el modelo de Von Neumann
No full textThis paper shows the existence of a reproducible competitive equilibrium in the general Von Neumann growth model, extending in this way a result due to Roemer.
Convergence of sequential and asynchronous nonlinear paracontractions
No full textElsner L, Koltracht I, Neumann M. Convergence of sequential and asynchronous nonlinear paracontractions. Numerische Mathematik. 1992;62(1):305-319.We establish the convergence of sequential and asynchronous iteration schemes for nonlinear paracontracting operators acting in finite dimensional spaces. Applications to the solution of linear systems of equations with convex constraints are outlined. A first generalization of one of our convergence results to an infinite pool of asymptotically paracontracting operators is also presented
Three nontrivial solutions for the p-Laplacian Neumann problems with a concave nonlinearity near the origin
No full textWe 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
On The Two Dimensional Gierer-Meinhardt system with strong coupling
No full textWe construct
solutions with
a single interior condensation point
for the
two-dimensional
Gierer-Meinhardt
system with strong coupling.
The condensation point is
located at a nondegenerate critical point of the diagonal part of the
regular part of the Green's function for -\Delta +1 nder the Neumann
boundary condition.
Our method is based on Liapunov-Schmidt reduction for a system of elliptic equations
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
Type II<sub>1</sub> factors satisfying the spatial isomorphism conjecture
No full textThis paper addresses a conjecture in the work by Kadison and Kastler [Kadison RV, Kastler D (1972) Am J Math 94:38–54] that a von Neumann algebra M on a Hilbert space H should be unitarily equivalent to each sufficiently close von Neumann algebra N, and, moreover, the implementing unitary can be chosen to be close to the identity operator. This conjecture is known to be true for amenable von Neumann algebras, and in this paper, we describe classes of nonamenable factors for which the conjecture is valid. These classes are based on tensor products of the hyperfinite II<sub>1</sub> factor with crossed products of abelian algebras by suitably chosen discrete groups
Recommended from our members
A letter from Thomas L. Neumann, Assistant Staff director for Regional Programs for the United States Commission on Civil Rights, to Dr. Hector P. Garcia, informing him of an attached Advisory Committee Membership Certificate.
No full textA letter from Thomas L. Neumann, Assistant Staff director for Regional Programs for the United States Commission on Civil Rights, to Dr. Hector P. Garcia, informing him of an attached Advisory Committee Membership Certificate
Groupe V/a : Rapports sur le mémoire de M. G. L. Neumann. Rapports des Commissaires
No full textHomès-Van Schoor Germaine, Lebrun Jean, Homès Marcel Victor. Groupe V/a : Rapports sur le mémoire de M. G. L. Neumann. Rapports des Commissaires. In: Bulletin de la Classe des sciences, tome 66, 1980. pp. 837-839
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