factorization of k-quasihyponormal operators
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ID: 260369
1991
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Abstract
Let A be the class of all operators T on a Hilbert space H such that
R(T*kT), the range space of T*KT, is contained in R(T*k+1), for a positive integer k.
It has been shown that if T ϵ A, there exists a unique operator CT
on H such that
(i) T*kT=T*k+1CT ;(ii) ‖CT‖2=inf{μ:μ≥0 and (T*kT)(T*kT)*≤μT*k+1T*k+1} ;(iii) N(CT)=N(T*kT) and(iv) R(CT)⫅R(T*k+1)¯
The main objective of this paper is to characterize k-quasihyponormal; normal, and
self-adjoint operators T in A in terms of CT. Throughout the paper, unless stated
otherwise, H will denote a complex Hilbert space and T an operator on H, i.e., a
bounded linear transformation from H into H itself. For an operator T, we write R(T)
and N(T) to denote the range space and the null space of T.
| Reference Key |
arora1991internationalfactorization
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|---|---|
| Authors | ;S. C. Arora;J. K. Thukral |
| Journal | structural engineering and mechanics |
| Year | 1991 |
| DOI |
10.1155/S0161171291000583
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| URL | |
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