Results 91 to 100 of about 137 (130)

On subclasses of hyponormal operators

Proceedings of the Japan Academy, Series A, Mathematical Sciences, 1975
Fujii, Masatoshi, Nakatsu, Yasuhiko
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On unbounded hyponormal operators

Arkiv för Matematik, 1989
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Weakly k-hyponormal and polynomially hyponormal commuting operator pairs

Science China Mathematics, 2014
The authors introduce the notion of weak \(k\)-hyponormality and polynomial hyponormality for commuting operator pairs on a Hilbert space and investigate their relationship with \(k\)-hyponormality and subnormality. They provide examples of 2-variable weighted shifts which are weakly 1-hyponormal but not hyponormal.
Tingting Qi
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?-Hyponormal operators

Integral Equations and Operator Theory, 2000
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Aluthge, Ariyadasa, Wang, Derming
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Hyponormal Composition Operators

Bulletin of the London Mathematical Society, 1986
Let (X,\(\Sigma\),m) be a complete \(\sigma\)-finite measure space, and let T be a \(\Sigma\)-measurable mapping in X such that \(m\circ T^{-1}\) is absolutely continuous with respect to m. The corresponding weighted composition operator W on \(L^ 2(X,\Sigma,m)\) generated by the weight function \(\phi\) is defined by \(Wf:=\phi f\circ T\).
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On spectra ofp-hyponormal operators

Integral Equations and Operator Theory, 1995
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Chō, M., Itoh, M.
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Operations with Hyponormal Operators

1989
It is the aim of the present chapter to collect some of the operations which preserve the class of hyponormal operators. We have already seen in Example II.2.1 that the square of a hyponormal operator may not be hyponormal. Thus the analytic functional calculus is excluded from these operations.
Mircea Martin, Mihai Putinar
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On hyponormality of Toeplitz operators

Rocky Mountain Journal of Mathematics, 2021
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Sadraoui, Houcine, Garayev, Mubariz, Guediri, Hocine   +2 more
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On Analytic Roots of Hyponormal Operators

Mediterranean Journal of Mathematics, 2017
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Jung, Sungeun, Ko, Eungil
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