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Śleszyński–Pringsheim theorem
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Śleszyński–Pringsheim theorem : ウィキペディア英語版
Śleszyński–Pringsheim theorem
In mathematics, the Śleszyński–Pringsheim theorem is a statement about convergence of certain continued fractions. It was discovered by Ivan Śleszyński and Alfred Pringsheim in the late 19th century.〔W.J.Thron has found evidence that Pringsheim was aware of the work of Śleszyński before he published his article; see 〕
It states that if ''a''''n'', ''b''''n'', for ''n'' = 1, 2, 3, ... are real numbers and |''b''''n''| ≥ |''a''''n''| + 1 for all ''n'', then
: \cfrac}}
converges absolutely to a number ''ƒ'' satisfying 0 < |''ƒ''| < 1, meaning that the series
: f = \sum_n \left\ - \frac}\right\},
where ''A''''n'' / ''B''''n'' are the convergents of the continued fraction, converges absolutely.
==See also==

*Convergence problem

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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