作者eric80520 (freejustice)
看板Math
标题[微积] 一题高微
时间Fri May 20 07:44:13 2011
题目是 ∞
Suppose that {a } is a bounded sequence of real numbers.
k k=0
Prove that ∞
f(x):= Σ (a *x^k)
k=0 k
has a positive radius of convergence.
可以帮忙解答吗?
谢谢
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