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Criteria for C-Disfocality of a Self-Adjoint Vector Difference Equation

✍ Scribed by T. Peil; A. Peterson


Publisher
Elsevier Science
Year
1993
Tongue
English
Weight
354 KB
Volume
179
Category
Article
ISSN
0022-247X

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## Abstract In 1980, Gasymov showed that non‐self‐adjoint Hill operators with complex‐valued periodic potentials of the type $ V(x) = \sum ^{\infty} \_{k=1} a\_{k} e^{ikx} $, with $ \sum ^{\infty} \_{k=1} \vert a\_{k} \vert < \infty $, have spectra [0, ∞). In this note, we provide an alternative an