…Here, λ j is a complex constant, and φ j ( t ) is a single-valued regular function in the domain 0 < | t - t 0 | < r (where r is a positive number) (exceptionally, a term containing log( t - t 0 ) may appear). When φ j ( t ) has at most a pole at t 0 , t 0 is called a definite singular point of (8), and when it has an essential singular point at t 0 , t 0 is called an indeterminate singular point of (8). When t 0 is a definite singular point, it is possible to calculate all the coefficients of the Laurent expansion of the constant λ j and φ j ( t ) at t 0. … *Some of the terminology explanations that mention "definite singularity" are listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
…ここにλjは複素定数で,φj(t)は領域0<|t-t0|<r(rはある正の数)で1価正則な関数である(例外的にはlog(t-t0)を含む項があらわれることもある)。φj(t)がt0でたかだか極しかもたないときt0を(8)の確定特異点,t0に真性特異点をもつときt0を(8)の不確定特異点という。t0が確定特異点のときには定数λjおよびφj(t)のt0におけるローラン展開の係数をすべて計算できる。… ※「確定特異点」について言及している用語解説の一部を掲載しています。 出典|株式会社平凡社世界大百科事典 第2版について | 情報 |
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