作者Eliphalet (带港币八蚊)
站内trans_math
标题Re: [考古] 90清大化工 (级数)
时间Sat Jun 27 21:40:28 2009
※ 引述《midarmyman (midarmyman)》之铭言：
: prove that if the series (an)^2 converges,then series an/n converges
: absolutely.
: (n皆为下标)
由算几不等式 2 abs(a_n)/n ≦ a_n^2 + 1/n^2
由你的假设 , Σa_n/n converges absolutely .
有错请指教
--
※ 发信站: 批踢踢实业坊(ptt.cc)
◆ From: 122.127.117.7
1F：推 midarmyman:thanks 114.41.246.165 06/27 22:13