Search engine for discovering works of Art, research articles, and books related to Art and Culture
Javascript must be enabled to continue!
On Kreĭn's extension theory of nonnegative operators
View through CrossRef
AbstractIn M. G. Kreĭn's extension theory of nonnegative operators a complete description is given of all nonnegative selfadjoint extensions of a densely defined nonnegative operator. This theory, the refinements to the theory due to T. Ando and K. Nishio, and its extension to the case of nondensely defined nonnegative operators is being presented in a unified way, building on the completion of nonnegative operator blocks. The completion of nonnegative operator blocks gives rise to a description of all selfadjoint contractive extensions of a symmetric (nonselfadjoint) contraction. This in turn is equivalent to a description of all nonnegative selfadjoint relation (multivalued operator) extensions of a nonnegative relation. (© 2004 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Title: On Kreĭn's extension theory of nonnegative operators
Description:
AbstractIn M.
G.
Kreĭn's extension theory of nonnegative operators a complete description is given of all nonnegative selfadjoint extensions of a densely defined nonnegative operator.
This theory, the refinements to the theory due to T.
Ando and K.
Nishio, and its extension to the case of nondensely defined nonnegative operators is being presented in a unified way, building on the completion of nonnegative operator blocks.
The completion of nonnegative operator blocks gives rise to a description of all selfadjoint contractive extensions of a symmetric (nonselfadjoint) contraction.
This in turn is equivalent to a description of all nonnegative selfadjoint relation (multivalued operator) extensions of a nonnegative relation.
(© 2004 WILEY‐VCH Verlag GmbH & Co.
KGaA, Weinheim).
Related Results
A Seminar Title On the History and Evolution of Agricultural Extension in the Ethiopia Country
A Seminar Title On the History and Evolution of Agricultural Extension in the Ethiopia Country
Agricultural extension service began work in Ethiopia since 1931, during the establishment of Ambo Agricultural School. But a formal Agricultural extension started since Alemaya Im...
Krein–Sobolev Orthogonal Polynomials II
Krein–Sobolev Orthogonal Polynomials II
In a recent paper, Littlejohn and Quintero studied the orthogonal polynomials {Kn}n=0∞—which they named Krein–Sobolev polynomials—that are orthogonal in the classical Sobolev space...
O “estado da arte” do ensino em Extensão Rural no Brasil
O “estado da arte” do ensino em Extensão Rural no Brasil
Este artigo tem como objetivo realizar uma análise do “estado da arte” do ensino em Extensão Rural no Brasil, considerando o panorama da oferta da disciplina, as tendências acadêmi...
"Human factor" in emergency situations development at Nuclear Power Plants in the conditions of war
"Human factor" in emergency situations development at Nuclear Power Plants in the conditions of war
Since the beginning of Ukraine's full-scale war with the russian federation, the personnel of two Ukrainian Nuclear Power Plants (NPP) (Chornobyl and Zaporizhzhya) have been held h...
Discretization of equations Gelfand-Levitan-Krein and regularization algorithms
Discretization of equations Gelfand-Levitan-Krein and regularization algorithms
Abstract
The paper considers the initial-boundary-value inverse problem of acoustics for onedimensional and multidimensional cases. The inverse problems are to recon...
Quasi-Irreducibility of Nonnegative Biquadratic Tensors
Quasi-Irreducibility of Nonnegative Biquadratic Tensors
While the adjacency tensor of a bipartite 2-graph is a nonnegative biquadratic tensor, it is inherently reducible. To address this limitation, we introduce the concept of quasi-irr...
LEVEL OF EXTENSION METHODS IMPORTANCE FROM THE AGRICULTURAL EXTENSION WORKERS POINT OF VIEW IN SULAIMANI GOVERNORATE
LEVEL OF EXTENSION METHODS IMPORTANCE FROM THE AGRICULTURAL EXTENSION WORKERS POINT OF VIEW IN SULAIMANI GOVERNORATE
The aim of this study was to determine the level of agricultural extension methods importance from the extension workers point of view in Sulaimani governorate, then identify relat...
Uma universidade possível à luz da extensão e da Educação Popular
Uma universidade possível à luz da extensão e da Educação Popular
Este artigo tem como objetivo trazer uma reflexão em torno da universidade brasileira em uma perspectiva histórico-crítica, a fim de apresentar um caminho possível para a elaboraçã...