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In mathematics, the E-function was introduced by to extend the generalized hypergeometric series ''p''''F''''q''(·) to the case ''p'' > ''q'' + 1. The underlying objective was to define a very general function that includes as particular cases the majority of the special functions known until then. However, this function had no great impact on the literature as it can always be expressed in terms of the Meijer G-function, while the opposite is not true, so that the G-function is of a still more general nature. ==Definition== There are several ways to define the MacRobert E-function; the following definition is in terms of the generalized hypergeometric function: * when ''p'' ≤ ''q'' and ''x'' ≠ 0, or ''p'' = ''q'' + 1 and |''x''| > 1: : * when ''p'' ≥ ''q'' + 2, or ''p'' = ''q'' + 1 and |''x''| < 1: : The asterisks here remind us to ignore the contribution with index ''j'' = ''h'' as follows: In the product this amounts to replacing Γ(0) with 1, and in the argument of the hypergeometric function this amounts to shortening the vector length from ''p'' to ''p'' − 1. Evidently, this definition covers all values of ''p'' and ''q''. 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「MacRobert E function」の詳細全文を読む スポンサード リンク
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