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On (n,k)-quasiparanormal operators

Jiangtao YuanGuoxing Ji — 2012

Studia Mathematica

Let T be a bounded linear operator on a complex Hilbert space . For positive integers n and k, an operator T is called (n,k)-quasiparanormal if | | T 1 + n ( T k x ) | | 1 / ( 1 + n ) | | T k x | | n / ( 1 + n ) | | T ( T k x ) | | for x ∈ . The class of (n,k)-quasiparanormal operators contains the classes of n-paranormal and k-quasiparanormal operators. We consider some properties of (n,k)-quasiparanormal operators: (1) inclusion relations and examples; (2) a matrix representation and SVEP (single valued extension property); (3) ascent and Bishop’s property (β); (4) quasinilpotent...

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