Zobrazeno 1 - 10
of 31
pro vyhledávání: '"G.A. Bagheri"'
Publikováno v:
Positivity. 25:369-378
Here, we show the equivalent conditions for integrability and being almost everywhere zero of trace-class operator-valued functions with respect to some spectral measure. Furthermore, we investigate the relation between the convergence of these funct
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::20b90961e288846fab641996b76079c2
https://doi.org/10.1007/s11117-020-00767-5
https://doi.org/10.1007/s11117-020-00767-5
Publikováno v:
Linear Algebra and its Applications. 583:102-118
Following a recent work of authors [1] , we establish the algebraic analogs of three major decomposition theorems of Nagy-Foias-Langer, Halmos-Wallen and Fishel in Baer ⁎-rings. This approach not only provides purely algebraic and shorter proofs of
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::40e17216d0b563142c3f21071c3608d5
https://doi.org/10.1016/j.laa.2019.08.022
https://doi.org/10.1016/j.laa.2019.08.022
Autor:
G.A. Bagheri-Bardi
Publikováno v:
Topology and its Applications. 252:1-8
The main goal of this paper is to find an approach to the following problem. How could a criterion be achieved so the spaces fulfilling it deserve to be considered in the range of vector-valued measurable functions?
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::a45bbc9e894757cafac9635505eafa01
https://doi.org/10.1016/j.topol.2018.11.002
https://doi.org/10.1016/j.topol.2018.11.002
Publikováno v:
Physica B: Condensed Matter. 552:214-220
In this study, an equiatomic mixture of Ni and Ti powders has been mechanically milled for 180 h in a planetary mill in order to study the product phase of milling process. Miedema's semi empirical method has been used in order to calculate the energ
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::0b977ea41e133f1228385a8d82f02429
https://doi.org/10.1016/j.physb.2018.10.015
https://doi.org/10.1016/j.physb.2018.10.015
Publikováno v:
Linear Algebra and its Applications. 539:117-133
A fundamental theorem due to Wold asserts that an isometry T on a Hilbert space H is the orthogonal direct sum of a unitary operator and a unilateral shift. Our main goal is to prove algebraic analogs of this result and its generalizations for commut
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::3e0b9b1faf44e173c315052e82b6b7ab
https://doi.org/10.1016/j.laa.2017.10.024
https://doi.org/10.1016/j.laa.2017.10.024
Publikováno v:
Filomat. 32:4413-4418
Here, we extend three basic facts from classical measure theory to operator-valued case. At first we show that operator-valued measurable functions may be approximated by simple ones. In the sequel, two fundamental theorems Egoroff and Lusin are exte
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::4a6d7cc8aef6f807a1f33f8c71b229c4
https://doi.org/10.2298/fil1812413b
https://doi.org/10.2298/fil1812413b
Publikováno v:
Colloquium Mathematicum. 151:147-155
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::012890a67b181f269e1ab59e34cca337
https://doi.org/10.4064/cm6777-3-2017
https://doi.org/10.4064/cm6777-3-2017
Publikováno v:
Bulletin des Sciences Mathématiques. 172:103049
In this paper we continue our investigation of Wold-type decomposition in Baer ⁎-rings. We obtain further information on building blocks of commuting pairs of isometries, by constructing Popovici decomposition of bi-isometries in Baer ⁎-rings. Th
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::9de4f1cecc602fb3813265e9f03b8842
https://doi.org/10.1016/j.bulsci.2021.103049
https://doi.org/10.1016/j.bulsci.2021.103049
Autor:
G.A. Bagheri-Bardi
Publikováno v:
Tsukuba J. Math. 39, no. 1 (2015), 15-28
Let $\{G_{}\}^n_{i=1}$ be locally compact groups and $\mathscr{H}$ be Hilbert space. We define the n-variable Fourier-Stieltjes algebra $B(\Pi^{n}_{1} G_{i}, \mathrm{B}(\mathscr{H}))$ consists all functions \[ \phi : G_{1} \times \cdot \times G_{n} \
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::9d784b056114365e898e4656aef5475e
https://tsukuba.repo.nii.ac.jp/records/2002235
https://tsukuba.repo.nii.ac.jp/records/2002235
Publikováno v:
Proc. Japan Acad. Ser. A Math. Sci. 93, no. 2 (2017), 7-11
Although there exist different types of (well-known) locally convex topologies on $\mathbf{B}(\mathcal{H})$, the notion of measurability on the set of operator valued functions $f:\Omega\to \mathbf{B}(\mathcal{H})$ is unique when $\mathcal{H}$ is sep
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::655c0870c5a347861c39d7d05525d57c
https://doi.org/10.3792/pjaa.93.7
https://doi.org/10.3792/pjaa.93.7