Co-Isometric Weighted Composition Operators on Hilbert Spaces of Analytic Functions
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DOI: 10.1007/s00025-020-01253-w
Abstract: We obtain a necessary and sufficient condition for a weighted composition operator to be co-isometric on a general weighted Hardy space of analytic functions in the unit disk whose reproducing kernel has the usual natural… read more here.
Keywords: weighted composition; analytic functions; isometric weighted; operators hilbert ... See more keywords
Some Results on (A; (m, n))-Isosymmetric Operators on a Hilbert Space
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DOI: 10.1007/s41980-021-00602-x
Abstract: In this paper, we introduce the class of (A; (m, n))-isosymmetric operators and we study some of their properties, for a positive semi-definite operator A and $$ m,n\in {\mathbb {N}}$$ , which extend, by changing the initial… read more here.
Keywords: operator; isosymmetric operators; operators hilbert; hilbert space ... See more keywords
On some numerical radius inequalities for normal operators in Hilbert spaces
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DOI: 10.1080/09720502.2021.1930658
Abstract: Abstract Let T be a normal bounded operator on a Hilbert space and let ω(T) denote the numerical radius of T. In this paper, we give new inequalities numerical radius of normal operatos on a… read more here.
Keywords: normal operators; numerical radius; radius inequalities; operators hilbert ... See more keywords
The graded structure induced by operators on a Hilbert space
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DOI: 10.2969/jmsj/07027503
Abstract: In this paper we define a graded structure induced by operators on a Hilbert space. Then we introduce several concepts which are related to the graded structure and examine some of their basic properties. A… read more here.
Keywords: graded structure; space; operators hilbert; structure ... See more keywords
Variations in the Tensorial Trapezoid Type Inequalities for Convex Functions of Self-Adjoint Operators in Hilbert Spaces
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DOI: 10.3390/sym16010121
Abstract: In this paper, various tensorial inequalities of trapezoid type were obtained. Identity from classical analysis is utilized to obtain the tensorial version of the said identity which in turn allowed us to obtain tensorial inequalities… read more here.
Keywords: operators hilbert; trapezoid type; functions self; self adjoint ... See more keywords