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- One can calculate only a few terms of a perturbation expansion, usually no more than two or three, and almost never more than seven. The resulting series is often slowly convergent, or even divergent. Yet those few terms contain a remarkable amount of information, which the investigator should do his best to extract. (en)
- This viewpoint has been persuasively set forth in a delightful paper by Shanks , who displays a number of amazing examples, including several from fluid mechanics. (en)
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