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Abel's inequality : ウィキペディア英語版
Abel's inequality
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
:
\left |\sum_^n a_k b_k \right | \le \operatorname_ |B_k| (|a_n| + a_n - a_1),

and if is nonincreasing, it holds that
:
\left |\sum_^n a_k b_k \right | \le \operatorname_ |B_k| (|a_n| - a_n + a_1),

where
:
B_k =b_1+\cdots+b_k.

In particular, if the sequence is nonincreasing and nonnegative, it follows that
:
\left |\sum_^n a_k b_k \right | \le \operatorname_ |B_k| a_1,

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
:
\sum_^n a_k b_k = a_n B_n - \sum_^ B_k (a_ - a_k).

==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)
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