Search results for "Matematica"
showing 10 items of 1637 documents
MR2846469 Salmi, Pekka Quantum semigroup compactifications and uniform continuity on locally compact quantum groups. Illinois J. Math. 54 (2010), no.…
2012
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.
Representation of quasi-measure by a Henstock-Kurzweil type integral on a compact zero-dimensional metric space
2009
A derivation basis is introduced in a compact zero-dimensional metric space X. A Henstock-Kurzweil type integral with respect to this basis is defined and used to represent the so-called quasi-measure on X.
Weyl's and Browder's theorems through the quasi-nilpotent part
2006
Weyl and Browder type theorems are characterized by means the quasi-nilpotent part
MR3088363 Reviewed Robdera, Mangatiana A. More on the equivalence properties of Radon-Nikodým property types and complete continuity types of Banach …
2013
MODULI DI BANACH SU C*-ALGEBRE: Rappresentazioni Hilbertiane ed in spazi Lp non commutativi
2006
La teoria delle *-rappresentazioni delle *-algebre localmente convesse o normate costituisce un argomento classico di cui dà conto una vasta letteratura. Le C*- algebre costituiscono sicuramente la classe di *-algebre di Banach per la quale la teoria delle rappresentazioni fornisce, probabilmente, i risultati più profondi ed importanti per le applicazioni. Nel 1964 R. Haag e D. Kastler formularono, in un celebre lavoro, il cosiddetto approccio algebrico alle teorie quantistiche per sistemi con infiniti gradi di libertà. In esso, ad una regione limitata dello spazio delle configurazioni del sistema, si associa la C*-algebra delle osservabili locali. L’unione di tutte queste C*-algebre costis…
MR2741185 Talvila, Erik The regulated primitive integral. Illinois J. Math. 53 (2009), no. 4, 1187–1219. (Reviewer: Luisa Di Piazza) 46G12 (26A39 46E…
2010
Talvila Erik, The regulated primitive integral. Illinois J. Math. 53 (2009), no. 4, 1187–1219, 46Gxx (26A39 46Exx) MR 2 741 185 A descriptive definition of an integral is a definition which provides a ``description'' of the space of primitives. The derivatives in some sense of the primitives are the integrands. In this paper the author introduces a descriptive method of integrating distributions: the regulated primitive integral. The set $\textbf{B}_R= \{F: [-\infty,\infty] \rightarrow {\bf R} \ \ | \mbox{ F {\it is regulated and left continuous on }}\\ \ \ {\bf R}, \ \ F(-\infty)=0, \ \ F(\infty)\in {\bf R}\}$ is the family of primitives. The derivative here is in the sense of the distribu…
Renato Caccioppoli, o' prufessore
2020
Sulla vita di Caccoppoli
An equivalent formulation of 0-closed sesquilinear forms
2022
AbstractIn 1970, McIntosh introduced the so-called 0-closed sesquilinear forms and proved a corresponding representation theorem. In this paper, we give a simple equivalent formulation of 0-closed sesquilinear forms. The main underlying idea is to consider minimal pairs of non-negative dominating forms.