Zobrazeno 1 - 10
of 27
pro vyhledávání: '"Maryam Amyari"'
Autor:
Ali Khalili, Maryam Amyari
Publikováno v:
AIMS Mathematics, Vol 4, Iss 3, Pp 527-533 (2019)
We define the concept of $\mathcal{A}$-valued norm parallelism in a Hilbert $\mathcal{A}$-module, and then we investigate some properties of this notion and present some characterizations of $\mathcal{A}$-valued norm parallelism in a Hilbert $\mathca
Externí odkaz:
https://doaj.org/article/0ef254837a52417aac015f9b5ea972fa
We introduce two notions of approximate isosceles ω-orthogonality and two notions of approximate ω-parallelism for bounded linear operators on a Hilbert space. Moreover , we state some basic properties of these notions and investigate some relation
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::76d1a6e6fe3194db320dcb68a099bace
https://doi.org/10.21203/rs.3.rs-2467267/v1
https://doi.org/10.21203/rs.3.rs-2467267/v1
Autor:
Maryam Amyari, Zahra Heydarbeygi
Publikováno v:
Kragujevac Journal of Mathematics. 45:191-202
In this paper, we get an improvement of the Hölder-McCarthy operator inequality in the case when r ≥ 1 and refine generalized inequalities involving powers of the numerical radius for sums and products of Hilbert space operators.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::7cdb82e3ba55d249f06eb3203d338d00
https://doi.org/10.46793/kgjmat2102.191h
https://doi.org/10.46793/kgjmat2102.191h
Publikováno v:
Mathematical Inequalities & Applications. :463-476
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::80270b7a7818c2ca0bb3d75689dddf25
https://doi.org/10.7153/mia-2021-24-32
https://doi.org/10.7153/mia-2021-24-32
Autor:
M. Mohammadi Gohari, Maryam Amyari
Publikováno v:
Indian Journal of Pure and Applied Mathematics. 51:1305-1316
Let ℌ be a Hilbert space, and let K(ℌ) be the C*-algebra of compact operators on ℌ. In this paper, we present some characterizations of the norm-parallelism for elements of a Hilbert K(ℌ)-module by employing the Birkhoff-James orthogonality.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::d1eaa9a4c90a04f60342e42071d447d3
https://doi.org/10.1007/s13226-020-0467-8
https://doi.org/10.1007/s13226-020-0467-8
Publikováno v:
Ukrains’kyi Matematychnyi Zhurnal. 72:1443-1451
We propose some refinements for the second inequality in $$ \frac{1}{2}\left\Vert A\right\Vert \le w(A)\le \left\Vert A\right\Vert, $$ where A ∈ B(H). In particular, if A is hyponormal, then, by refining the Young inequality with the Kantorovich co
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::3125f0059038bb6f442f4fd890f63b3a
https://doi.org/10.37863/umzh.v72i10.6027
https://doi.org/10.37863/umzh.v72i10.6027
Publikováno v:
Linear and Multilinear Algebra. 70:2619-2628
We investigate some aspects of various numerical radius orthogonalities and numerical radius parallelism for bounded linear operators on a Hilbert space H . Among several results, we show that if T...
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::8503a5297f9853af7238c95745c0b048
https://doi.org/10.1080/03081087.2020.1809618
https://doi.org/10.1080/03081087.2020.1809618
Autor:
Maryam Amyari, Ateyeh Saraei
Publikováno v:
Aequationes mathematicae. 94:137-149
In this paper, we investigate approximately orthogonality preserving maps in the setting of Krein spaces. More precisely, suppose that $${\mathcal {K}}_1$$ and $${\mathcal {K}}_2$$ are two Krein spaces and that $$T:{\mathcal {K}}_1\rightarrow {\mathc
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::ea638f158737984be3e3d5c21715fa2b
https://doi.org/10.1007/s00010-019-00695-0
https://doi.org/10.1007/s00010-019-00695-0
Publikováno v:
Tbilisi Math. J. 13, iss. 4 (2020), 183-191
In this paper, we present an extension of Kantorovich inequality for two operators on a Hilbert space. Also, the multiple version and a related inequality for positive linear maps are obtained. Moreover, we introduce the concept of Specht's ratio and
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::204e683bc961478d4984f56fb1cd8519
https://doi.org/10.32513/tbilisi/1608606057
https://doi.org/10.32513/tbilisi/1608606057
Autor:
Mahdi Mohammadi Gohari, Maryam Amyari
Publikováno v:
Mathematica Slovaca. 68:1431-1438
Suppose thatA,B∈ 𝔹(𝓗) are positive invertible operators. In this paper, we show thatA#B≤11−2μA12Fμ(A−12BA−12)A12 ≤12[A#B+Hμ(A,B)] ≤12[11−2μA12Fμ(A−12BA−12)A12+Hμ(A,B)] ≤⋯≤12nA#B+2n−12nHμ(A,B) ≤12n(1−2μ)A1
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::24d6eb2d910a6169aeaeca8ca016c256
https://doi.org/10.1515/ms-2017-0192
https://doi.org/10.1515/ms-2017-0192