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Noun
1. power seriesMathematics
Wikipedia definition
2. Power seriesIn mathematics, a power series (in one variable) is an infinite series of the form where an represents the coefficient of the nth term, c is a constant, and x varies around c (for this reason one sometimes speaks of the series as being centered at c). This series usually arises as the Taylor series of some known function; the Taylor series article contains many examples. In many situations c is equal to zero, for instance when considering a Maclaurin series.
Read “Power series” on English Wikipedia
Read “冪級数” on Japanese Wikipedia
Read “Power series” on DBpedia
Other forms
冪級数 【べききゅうすう】羃級数 【べききゅうすう】

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