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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Periodic continued fraction ： ウィキペディア英語版 Periodic continued fraction In mathematics, an infinite periodic continued fraction is a continued fraction that can be placed in the form :$$ x = a_0 + \cfrac + \cfrac}}}}}}}}\, where the initial block of ''k'' + 1 partial denominators is followed by a block () of partial denominators that repeats over and over again, ''ad infinitum''. For example $\backslash sqrt2$ can be expanded to a periodic continued fraction, namely as (). The partial denominators can in general be any real or complex numbers. That general case is treated in the article convergence problem. The remainder of this article is devoted to the subject of simple continued fractions that are also periodic. In other words, the remainder of this article assumes that all the partial denominators ''a''''i'' (''i'' ≥ 1) are positive integers. ==Purely periodic and periodic fractions== Since all the partial numerators in a regular continued fraction are equal to unity we can adopt a shorthand notation in which the continued fraction shown above is written as :$$ \begin x& = ()\\ & = () \end where, in the second line, a vinculum marks the repeating block. Some textbooks use the notation :$$ \begin x& = (a_,a_,\dots,\dot a_ ) \end where the repeating block is indicated by dots over its first and last terms. If the initial non-repeating block is not present – that is, if :$$ x = (), the regular continued fraction ''x'' is said to be ''purely periodic''. For example, the regular continued fraction for the golden ratio φ – given by () – is purely periodic, while the regular continued fraction for the square root of two – () – is periodic, but not purely periodic. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Periodic continued fraction」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.