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Abel's test
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Abel's test : ウィキペディア英語版
Abel's test

In mathematics, Abel's test (also known as Abel's criterion) is a method of testing for the convergence of an infinite series. The test is named after mathematician Niels Henrik Abel. There are two slightly different versions of Abel's test – one is used with series of real numbers, and the other is used with power series in complex analysis. Abel's uniform convergence test is a criterion for the uniform convergence of a series of functions dependent on parameters.
== Abel's test in real analysis ==

Suppose the following statements are true:
# \sum a_n is a convergent series,
# is a monotone sequence, and
# is bounded.
Then \sum a_nb_n is also convergent.
It is important to understand that this test is mainly pertinent and
useful in the context of non absolutely convergent series \sum a_n.
For absolutely convergent series, this theorem, albeit true, is almost evident.

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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