Mathematical Sciences Classification System
30Bxx - Series expansions
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                            30B10Power series (including lacunary series)
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                            30B20Random power series
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                            30B30Boundary behavior of power series, over-convergence
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                            30B40Analytic continuation
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                            30B50
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                            30B60Completeness problems, closure of a system of functions
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                            30B70
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                            30B99None of the above, but in this section