Titlebook: Recent Advances in Operator Theory, Operator Algebras, and their Applications; XIXth International Dumitru Ga?par,Dan Timotin,Florian-Hori

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Commuting Triples of Subnormal Operators and Related Moment Problems,u?? and N. Suciu, {xc[4]}, for commuting pairs) we shall give necessary and sufficient conditions on a triple indexed sequence of vectors from a Hilbert space such that it can be expressed as moments of an appropriate triple of commuting operators. We obtain an extension of Z. Sebestyén’s similar re

花束

The Equality of the Reduced and the Full ,*-Algebras and the Amenability of a Topological Groupoid,d and the full .*-algebras. In this paper we shall prove the converse assertion under a technical hypothesis. We shall prove that if . is a locally compact second countable groupoid endowed with a Haar system having ”a bounded decomposition over the principal groupoid associated to .”, then the equa

刻苦讀書

-Numerical Radius in Banach Spaces,f the . classes, which can be naturally extended. Then, we give a first study of this concept. Some of the properties given in the Banach case are original, but most of them are a generalization of the Hilbert case, even if the proofs have to be done in completely different ways.

存心

Generalized Toeplitz Operators and Cyclic Vectors,sociated with non zero elements of the point spectrum, when it is non void, of generalized Toeplitz operators. Introducing perturbed kernel, we consider classes . which extend the classical classes .. We give results about absolute continuity with respect to the Haar measure for operators in class .

手術(shù)刀

不如樂死去

,Irreducible Subfactors Derived from Popa’s Construction for Non-Tracial States,states, to obtain an irreducible inclusion of . factors, . of index .. .(.) is identified with a subfactor inside the centralizer algebra of the canonical free product state on . ? .(?). Its structure is described by “infinite” semicircular elements as in {xc[32]}..The irreducible subfactor inclusio

Pcos971

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On the Distance between an Operator and an Ideal, two-sided ideal in .(.). If . is a tensor product of normed spaces, endowed with a tensor norm, an estimation is given for the distance of a tensor product operator . ?.(.) to .(.) and it is applied to the study of the quasi-nilpotency of tensor product operators modulo .(.).

發(fā)怨言

Uniform Exponential Stability and Uniform Observability of Time-Varying Linear Stochastic Systems iic equations in Hilbert spaces. We give a representation of the covariance operator associated to the mild solutions of these equations which allow us to obtain a characterization of the uniform exponential stability of uniformly observable systems in terms of Lyapunov equations.

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0255-0156 gle operator theory, C*-algebras, diffrential operators, intThe Romanian conferences in operator theory, as they are now commonly called, havestartedintheyear1976asanannualworkshoponoperatortheoryheldatthe University of Timi? soara, originally only with Romanian attendance. The meeting soon evolved