[微積] 無窮級數判斷斂散性
If ΣAn and ΣBn are both convergent series with positive terms, is it true
that ΣAnBn is also Convergent ?
我記得沒錯的話Σ不能相乘
所以我認為答案應該是不一定吧
但總覺得怪怪的
不知道有沒有正確的解法
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