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almost convergent sequence : ウィキペディア英語版
almost convergent sequence
A bounded real sequence (x_n) is said to be ''almost convergent'' to L if each Banach limit assigns
the same value L to the sequence (x_n).
Lorentz proved that (x_n) is almost convergent if and only if
:\lim\limits_ \frac}p=L
uniformly in n.
The above limit can be rewritten in detail as
:(\forall \varepsilon>0) (\exists p_0) (\forall p>p_0) (\forall n) \left|\frac}p-L\right|<\varepsilon.
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)
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