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In mathematical analysis, the Foias constant, is a number named after Ciprian Foias. If ''x''1 > 0 and : then the Foias constant is the unique real number ''α'' such that if ''x''1 = ''α'' then the sequence diverges to ∞.〔Ewing, J. and Foias, C. "An Interesting Serendipitous Real Number." In ''Finite versus Infinite: Contributions to an Eternal Dilemma'' (Ed. C. Caluse and G. Păun). London: Springer-Verlag, pp. 119–126, 2000.〕 Numerically, it is : . No closed form is known. When ''x''1 = ''α'' then we have the limit: : where "log" denotes the usual natural logarithm. A fortuitous observation between the prime number theorem and this constant goes as follows, : where is the prime-counting function.〔Ewing, J. and Foias, C. "An Interesting Serendipitous Real Number." In ''Finite versus Infinite: Contributions to an Eternal Dilemma'' (Ed. C. Caluse and G. Păun). London: Springer-Verlag, pp. 119–126, 2000.〕 ==See also== *Mathematical constant 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「Foias constant」の詳細全文を読む スポンサード リンク
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