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In mathematics, Abel's inequality, named after Niels Henrik Abel, supplies a simple bound on the absolute value of the inner product of two vectors in an important special case. Let be a sequence of real numbers that is either nonincreasing or nondecreasing, and let be a sequence of real or complex numbers. If is nondecreasing, it holds that : and if is nonincreasing, it holds that : where : In particular, if the sequence is nonincreasing and nonnegative, it follows that : Abel's inequality follows easily from Abel's transformation, which is the discrete version of integration by parts: If and are sequences of real or complex numbers, it holds that : ==References== * * ''(''Abel's inequality'' )'' in ''Encyclopedia of Mathematics''. 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「Abel's inequality」の詳細全文を読む スポンサード リンク
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