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Sitati IN, Nzimbi BM, Luketero SW, Khalagai JM. "On A-Self-Adjoint, A-Unitary Operators and Quasiaffinities." SciencePG journals. 2016;Vol. 1(3 ):56-60. Abstract

In this paper, we investigate properties of A-self-adjoint operators and other relations on Hilbert spaces. In this
context, A is a self-adjoint and an invertible operator. More results on operator equivalences including similarity, unitary and metric equivalences are discussed. We also investigate conditions under which these classes of operators are self- adjoint and unitary. We finally locate their spectra.

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