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VOLUME 21 (1975) | ISSUE 10 | PAGE 621
Eigenfunction expansion of a Schrodinger operator with a complex potential
A localization is presented of the spectrum of the operator L = -(θ2/Эх2) + u{x) with a complex periodic potential u{x). Formulas are presented for the expansion of functions that are summable over (—00, <») in eigenfunctions of the operator and of the Parseval equation.