"Logarithmic perturbation theory is an alternative way of solving the perturbation equations in the coordinate representation. It was developed many years ago ... and has lately been widely discussed and applied to many problems in quantum mechanics. ... perturbation theory allows us to transform the nonlinear Riccati equation ... into a set of linear differential equations ..."
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Francisco M. FernĂĄndez:
https://en.wikiquote.org/wiki/Perturbation_theory_(quantum_mechanics)
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Perturbation theory (quantum mechanics)
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