Search results for "operators"
showing 10 items of 228 documents
MR2903153 Roch, Steffen; Santos, Pedro A. Two points, one limit: homogenization techniques for two-point local algebras. J. Math. Anal. Appl. 391 (20…
2013
Perturbations of polaroid type operators on Banach spaces and Applications
2011
We study the permanence of polaroid type conditions under perturbations
Operator (Quasi-)Similarity, Quasi-Hermitian Operators and All that
2016
Motivated by the recent developments of pseudo-Hermitian quantum mechanics, we analyze the structure generated by unbounded metric operators in a Hilbert space. To that effect, we consider the notions of similarity and quasi-similarity between operators and explore to what extent they preserve spectral properties. Then we study quasi-Hermitian operators, bounded or not, that is, operators that are quasisimilar to their adjoint and we discuss their application in pseudo-Hermitian quantum mechanics. Finally, we extend the analysis to operators in a partial inner product space (PIP-space), in particular the scale of Hilbert spaces generated by a single unbounded metric operator.
Partial inner product spaces and operators on them
2010
Some remarks on quasi-Hermitian operators
2014
A quasi-Hermitian operator is an operator that is similar to its adjoint in some sense, via a metric operator, i.e., a strictly positive self-adjoint operator.Whereas those metric operators are in general assumed to be bounded, we analyze the structure generated by unbounded metric operators in a Hilbert space. Following our previous work, we introduce several generalizations of the notion of similarity between operators. Then we explore systematically the various types of quasi-Hermitian operators, bounded or not. Finally, we discuss their application in the so-called pseudo-Hermitian quantum mechanics.
MR2806473 (2012f:47002) Hirasawa, Go(J-IBARE) A metric for unbounded linear operators in a Hilbert space. (English summary) Integral Equations Operat…
2012
A Lebesgue-type decomposition on one side for sesquilinear forms
2021
Sesquilinear forms which are not necessarily positive may have a dierent behavior, with respect to a positive form, on each side. For this reason a Lebesgue-type decomposition on one side is provided for generic forms satisfying a boundedness condition.
The PROVIDE Traning Courses for proximity violence' professionals
2020
The chapter describes a prototype of training course for "Expert operators in proximity violence" focusing on asylum-seeking migrant women victims of violence and implemented in three European States. In particular it defines: the rationale of training by modules in adapting individual abilities of professionals of migrazion field to the professional goals to be achieved (1), the methodological implementation of the PROVIDE courses (2) and the significance of the experiential seminars conducted (3).
Professionisti dell'accoglienza in Sicilia. Riflessività e consapevolezza in tema di violenza di prossimità.
2020
L’articolo descrive i risultati di una ricerca qualitativa, finanziata dalla Comunità Europea, finalizzata a conoscere il grado di riconoscimento della violenza di prossimità di cui sono vittima i rifugiati/richiedenti asilo da parte degli operatori che lavorano nel circuito dell’accoglienza nei CAS e negli SPRAR siciliani. La ricerca ha previsto la conduzione di 78 interviste a stakeholders. Il tema della violenza di prossimità viene quindi indagato attraverso le testimonianze degli operatori intervistati e la pluralità di cause e situazioni che la rendono possibile. The article describes the results of a qualitative research, finacied by EU aimed at knowing the degree of recognition of th…
In-Fiber Fractional Signal Processing: Recent Results and Applications
2018
The implementation of mathematical operators using photonic signal processing –as for example, conventional differentiators and integrators– is particularly well suited to overcome the speed and bandwidth limitations of electronics. In the Laboratory of Fiber Optics of the University of Valencia we work on the development of in-fiber time-domain fractional operators and their applications. In the last years we have made some specific proposals to perform photonic fractional differentiation (PFD), photonic fractional integration (PFI), photonic fractional Hilbert transform (PFHT), and photonic fractional Fourier transform (PFFT), using fiber-based technologies. Recently, we have been able to…