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Asymptotic Series and Expansions
2003The method of perturbations can be used to develop approximate solutions to differential equations, which have nonlinearities or variable coefficients so that an exact solution cannot be constructed. Questions of convergence of the perturbation expansion in terms of a suitable small parameter are abandoned if such an expansion can provide a useful ...
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Expansions in Series of Polynomials
Journal of the London Mathematical Society, 1968openaire +2 more sources