訂正日: 2006/08/29訂正理由: -訂正箇所: 引用文献情報訂正内容: Right : 1) Hardy and Littlewood: Tauberian theorem concerning power series and Dirichlet's series whose coefflcient are positive. Proc. London Math. Soc. 13 (1914). 2) Hardy and Littlewood: Abel's theorem and its converse. (II). Proc London Math. Soc. 22 (1923). 3) Wielandt: Zur Umkehrung des Abelschcn Stetigkeitssatzes. Math. Zeits. 56 (1952).