Mathematical Sciences Classification System
34Exx - Asymptotic theory
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                            34E05Asymptotic expansions
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                            34E10Perturbations, asymptotics
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                            34E13Multiple scale methods
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                            34E15Singular perturbations, general theory
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                            34E17Canard solutions
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                            34E18Methods of nonstandard analysis
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                            34E20Singular perturbations, turning point theory, WKB methods
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                            34E99None of the above, but in this section