Abstract
A theorem is proved regarding the expansion in the eigenfunctions of the one-dimensional Schrodinger equationL = −dz/dx2+q(x)(−∞<x<∞)with a potential q(x), satisfying the condition $$\int\limits_0^{ + \infty } {(1 + x^2 )|q(x) - q_ \pm (x)|dx< \infty ,} $$ where q±(x) are periodic functions.
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