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In this note, I introduce a mysterious approximation called the rotating wave approximation (RWA) to undergraduates or non-experts who are interested in both Mathematics and Quantum Optics.In Quantum Optics, it plays a very important role in order to obtain an analytic approximate solution of some Schrödinger equation, while it is curious from the mathematical point of view.I explain it carefully with two coherent oscillations for them and expect that they will overcome the problem in the near future.
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Kazuyuki Fujii (2017) studied this question.
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