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311731

Twice Differentiable Ostrowski Type Tensorial Norm Inequality for Continuous Functions of Selfadjoint Operators in Hilbert Spaces

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Last updated: 29 Dec 2024

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Abstract

In this paper several tensorial norm inequalities for continuous functions of selfadjoint operators in Hilbert space have been obtained. The
recent progression of the Hilbert space inequalities following the definition of the convex operator inequality has lead researchers to explore the
concept of Hilbert space inequalities even further. The motivation for
this paper stems from the recent development in the theory of tensorial
and Hilbert space inequalities. Multiple inequalities are obtained with
variations due to the convexity properties of the mapping $f$
$$\bigg|\bigg|\frac{1}{6}\left(\operatorname{exp}(A)\otimes 1+4\operatorname{exp}\left(\frac{A\otimes 1+1\otimes B}{2}\right)+1\otimes \operatorname{exp}(B)\right)$$
$$-\frac{1}{4}\bigg(\int_{0}^{1}\operatorname{exp}\left(\left(\frac{1-k}{2}\right)A\otimes 1+\left(\frac{1+k}{2}\right)1\otimes B\right)k^{-\frac{1}{2}}dk$$
$$+\int_{0}^{1}\operatorname{exp}\left(\left(1-\frac{k}{2}\right)A\otimes 1+\frac{k}{2}1\otimes B\right)(1-k)^{-\frac{1}{2}}dk\bigg)\bigg|\bigg|$$
$$\leq \frac{47}{360}\norm{1\otimes B-A\otimes 1}^{2}(\norm{\operatorname{exp}(A)}+\norm{\operatorname{exp}(B)}).$$
Tensorial version of a Lemma given by Hezenci is derived and utilized
to obtain the desired inequalities. In the introduction section is given a
brief history of the inequalities, while in the preliminary section we give
necessary Lemmas and results in order to understand the paper. Structure and novelty of the paper are discussed at the end of the introduction section.

DOI

10.21608/ejmaa.2023.199881.1014

Keywords

Tensorial product, Selfadjoint operators, convex functions, spectra

Authors

First Name

Vuk

Last Name

Stojiljkovic

MiddleName

-

Affiliation

Stevana Mokranjca 8

Email

vuk.stojiljkovic999@gmail.com

City

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Orcid

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Volume

11

Article Issue

2

Related Issue

39572

Issue Date

2023-07-01

Receive Date

2023-03-13

Publish Date

2023-07-01

Page Start

1

Page End

15

Print ISSN

3009-6731

Online ISSN

2090-729X

Link

https://ejmaa.journals.ekb.eg/article_311731.html

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https://ejmaa.journals.ekb.eg/service?article_code=311731

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311,731

Type

Regular research papers

Type Code

2,651

Publication Type

Journal

Publication Title

Electronic Journal of Mathematical Analysis and Applications

Publication Link

https://ejmaa.journals.ekb.eg/

MainTitle

Twice Differentiable Ostrowski Type Tensorial Norm Inequality for Continuous Functions of Selfadjoint Operators in Hilbert Spaces

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Article

Created At

18 Dec 2024