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