期刊
BULLETIN OF THE LONDON MATHEMATICAL SOCIETY
卷 34, 期 -, 页码 513-532出版社
WILEY
DOI: 10.1112/S0024609302001248
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A description is given of methods that have been used to analyze the spectrum of non-self-adjoint differential operators, emphasizing the differences from the self-adjoint theory. It transpires that even in cases in which the eigenfunctions can be determined explicitly, they often do not form a basis; this is closely related to a high degree of instability of the eigenvalues under small perturbations of the operator.
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