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A bounded real sequence is said to be ''almost convergent'' to if each Banach limit assigns the same value to the sequence . Lorentz proved that is almost convergent if and only if : uniformly in . The above limit can be rewritten in detail as : Almost convergence is studied in summability theory. It is an example of a summability method which cannot be represented as a matrix method. ==References== * G. Bennett and N.J. Kalton: "Consistency theorems for almost convergence." Trans. Amer. Math. Soc., 198:23--43, 1974. * J. Boos: "Classical and modern methods in summability." Oxford University Press, New York, 2000. * J. Connor and K.-G. Grosse-Erdmann: "Sequential definitions of continuity for real functions." Rocky Mt. J. Math., 33(1):93--121, 2003. * G.G. Lorentz: "A contribution to the theory of divergent sequences." Acta Math., 80:167--190, 1948. 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「almost convergent sequence」の詳細全文を読む スポンサード リンク
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