Remarks on the method of comparison equations (generalized WKB method) and the generalized Ermakov-Pinney equation
Abstract
The connection between the method of comparison equations (generalized WKB method) and the Ermakov-Pinney equation is established. A perturbative scheme of solution of the generalized Ermakov-Pinney equation is developed and is applied to the construction of perturbative series for second-order differential equations with and without turning points.
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