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In this paper we investigate the exactness of the WKB quantization conditionfor translationally shape invariant systems. In particular, using the formalismof supersymmetric quantum mechanics, we generalize the Langer correction andshow that it generates the exact quantization condition for all conventionalpotentials. We also prove that this correction is related to the previouslyproven exactness of SWKB for these potentials.

Generalized Langer Correction and the Exactness of WKB for all Conventional Potentials