Search results for "Matematica"
showing 10 items of 1637 documents
Operators in rigged Hilbert spaces: toward a spectral analysis
The Henstock-Kurzweil-Stieltjes type integral for real functions on a fractal subset of the real line
2011
The aim of this paper is to introduce an Henstock-Kurzweil type integration process for real functions on a fractal subset E of the real line.
MR2806473 (2012f:47002) Hirasawa, Go(J-IBARE) A metric for unbounded linear operators in a Hilbert space. (English summary) Integral Equations Operat…
2012
A note on semifinite von Neumann algebras
2009
In this note we give some techniques for constructing a faithful semi finite trace on a semifinite von Neumann algebra.
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.
Slight extensions of positive linear functionals: two concrete realizations.
2009
In this paper we show, in full details, some example of slight extensions of a nonclosable positive linear functional ώ defined on a dense *-subalgebra Ao of a given topological *-algebra.
MR3063436 Reviewed Znojil, Miloslav; Wu, Junde A generalized family of discrete PT-symmetric square wells. Internat. J. Theoret. Phys. 52 (2013), no.…
2014
Weyl's type theorems for polaroid operators
2008
Teoremi di Weyl per operatori polaroidi
FINVALI 2005 - Aree scientifiche: percorsi e risultati
2009
Si presenta l'attività di ricerca del PROGETTO FINALIZZATO “FINVALI 2005”: obiettivi cognitivi, saperi minimi e linguaggi nelle prove nazionali di fine ciclo relativamente all'area matematica e all’area delle scienze sperimentali.
MR3299506 Reviewed Rădulescu, Florin(I-ROME2) On unbounded, non-trivial Hochschild cohomology in finite von Neumann algebras and higher order Berezin…
2015
If (At)t>1 is a family of finite von Neumann algebras with a Chapman-Kolmogorov set of linear maps (symbol system) (Φs,t), and if αt:A→A are isomorphisms in a finite family of von Neumann algebras, the corresponding Hochschild cocycles are related to an obstruction to the deformation of the set of linear maps (Φs,t) in the corresponding Chapman-Kolmogorov system (Φs,t)˜ of completely positive maps. In this set-up, the author introduces an invariant (c,Z) for a finite von Neumann algebra M, consisting of a 2-Hochschild cohomology cocycle c and a coboundary unbounded operator Z for c. With some assumptions on c and Z=α+X+iY (α>0, Y is antisymmetric), the existence of an unbounded derivation δ…