Zobrazeno 1 - 10 of 72 pro vyhledávání: '"Mojtaba Bakherad"'
1
Akademický článek
Norm inequalities involving a special class of functions for sector matrices
Autor: Davood Afraz, Rahmatollah Lashkaripour, Mojtaba Bakherad
Publikováno v: Journal of Inequalities and Applications, Vol 2020, Iss 1, Pp 1-11 (2020)
Abstract In this paper, we present some unitarily invariant norm inequalities for sector matrices involving a special class of functions. In particular, if Z = ( Z 11 Z 12 Z 21 Z 22 ) is a 2 n × 2 n $2n\times 2n$ matrix such that numerical range of
Externí odkaz: https://doaj.org/article/f6ff8fe829a6479bb04224507ad21a11
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2
Akademický článek
New estimations for the Berezin number inequality
Autor: Mojtaba Bakherad, Ulas Yamancı
Publikováno v: Journal of Inequalities and Applications, Vol 2020, Iss 1, Pp 1-9 (2020)
Abstract In this paper, by the definition of Berezin number, we present some inequalities involving the operator geometric mean. For instance, it is shown that if X , Y , Z ∈ L ( H ) $X, Y, Z\in {\mathcal{L}}(\mathcal{H})$ such that X and Y are pos
Externí odkaz: https://doaj.org/article/d606d7959b1645e5b3424a5b1bf0471f
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3
Akademický článek
Improvement of Furuta’s Inequality with Applications to Numerical Radius
Autor: Mohammad W. Alomari, Mojtaba Bakherad, Monire Hajmohamadi, Christophe Chesneau, Víctor Leiva, Carlos Martin-Barreiro
Publikováno v: Mathematics, Vol 11, Iss 1, p 36 (2022)
In diverse branches of mathematics, several inequalities have been studied and applied. In this article, we improve Furuta’s inequality. Subsequently, we apply this improvement to obtain new radius inequalities that not been reported in the current
Externí odkaz: https://doaj.org/article/76c4a2ac508543eebf24186c0e820de8
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4
Refined Berezin number inequalities via superquadratic and convex functions
Autor: Fengsheng Chien, Mojtaba Bakherad, Mohammad Alomari
Publikováno v: Filomat. 37:265-277
In this paper, we generalize and refine some Berezin number inequalities for Hilbert space operators. Namely, we refine the Hermite-Hadamard inequality and some other recent results by using the concept of superquadraticity and convexity. Then we ext
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::bfe1f4f8c56dcc50beb0b0c135485b6d
https://doi.org/10.2298/fil2301265c
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6
Akademický článek
Reverses of Ando’s and Hölder–McCarty’s inequalities
Autor: Monire Hajmohamadi, Rahmatollah Lashkaripour, Mojtaba Bakherad
Publikováno v: Journal of Inequalities and Applications, Vol 2018, Iss 1, Pp 1-15 (2018)
Abstract In this paper, we give some reverse-types of Ando’s and Hölder–McCarthy’s inequalities for positive linear maps, and positive invertible operators. For this purpose, we use a recently improved Young inequality and its reverse.
Externí odkaz: https://doaj.org/article/e3466596eabf48fdbc0960e514be8e47
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7
Akademický článek
Extensions of interpolation between the arithmetic-geometric mean inequality for matrices
Autor: Mojtaba Bakherad, Rahmatollah Lashkaripour, Monire Hajmohamadi
Publikováno v: Journal of Inequalities and Applications, Vol 2017, Iss 1, Pp 1-10 (2017)
Abstract In this paper, we present some extensions of interpolation between the arithmetic-geometric means inequality. Among other inequalities, it is shown that if A, B, X are n × n $n\times n$ matrices, then ∥ A X B ∗ ∥ 2 ≤ ∥ f 1 ( A ∗
Externí odkaz: https://doaj.org/article/ec8c775a43c04023b1c30d7c86e2abb3
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