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The Fuglede-Putnam Theorem and Quasinormality for Class p-wA(s, t) Operators
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The Fuglede-Putnam Theorem and Quasinormality for Class p-wA(s, t) Operators

Mohammad H.M. Rashid and Nifeen Altaweel
European journal of pure and applied mathematics, Vol.15(3), pp.1067-1089
31/07/2022

Abstract

In this work, we demonstrate that (i) if T is a class p-wA(s, t) operator and T(s, t) is quasinormal (resp., normal), then T is also quasinormal (resp., normal) (ii) If T and T∗ are class p-wA(s, t) operators, then T is normal; (iii) the normal portions of quasisimilar class p-wA(s, t) operators are unitarily equivalent; and (iv) Fuglede-Putnam type theorem holds for a class p-wA(s, t) operator T for 0< s, t, s + t = 1 and 0 < p ≤ 1 if T satisfies a kernel condition ker(T) ⊂ ker(T∗).
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https://doi.org/10.29020/nybg.ejpam.v15i3.4412View
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