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Carleman's inequality : ウィキペディア英語版
Carleman's inequality
Carleman's inequality is an inequality in mathematics, named after Torsten Carleman, who proved it in 1923〔T. Carleman, ''Sur les fonctions quasi-analytiques'', Conférences faites au cinquième congres des mathématiciens Scandinaves, Helsinki (1923), 181-196.〕 and used it to prove the Denjoy–Carleman theorem on quasi-analytic classes.
==Statement==

Let ''a''1, ''a''2, ''a''3, ... be a sequence of non-negative real numbers, then
: \sum_^\infty \left(a_1 a_2 \cdots a_n\right)^ \le e \sum_^\infty a_n.
The constant ''e'' in the inequality is optimal, that is, the inequality does not always hold if ''e'' is replaced by a smaller number. The inequality is strict (it holds with "<" instead of "≤") if some element in the sequence is non-zero.

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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