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On Existence of a Biorthonormal Basis Composed of Eigenvectors of Non-Hermitian Operators

Toshiaki Tanaka

quant-pharXiv:quant-ph/0603075

Abstract

We present a set of necessary conditions for the existence of a biorthonormal basis composed of eigenvectors of non-Hermitian operators. As an illustration, we examine these conditions in the case of normal operators. We also provide a generalization of the conditions which is applicable to non-diagonalizable operators by considering not only eigenvectors but also all root vectors.

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