Abstract
We derive necessary and sufficient conditions for a one-dimensional periodic Schrödinger (i.e., Hill) operator H = − d 2 / d x 2 + V in L 2 ( R ) to be a spectral operator of scalar type. The conditions demonstrate the remarkable fact that the property of a Hill operator being a spectral operator is independent of smoothness (or even analyticity) properties of the potential V. To cite this article: F. Gesztesy, V. Tkachenko, C. R. Acad. Sci. Paris, Ser. I 343 (2006).
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