Re: [考古] 90清大化工 (級數)

[Eliphalet (帶港幣八蚊)]

※ 引述《midarmyman (midarmyman)》之銘言：
: prove that if the series (an)^2 converges,then series an/n converges
: absolutely.
: (n皆為下標)


由算幾不等式   2 abs(a_n)/n ≦  a_n^2 + 1/n^2

由你的假設 , Σa_n/n converges absolutely .

 有錯請指教

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推 midarmyman:thanks