作者eric80520 (freejustice)
看板Math
標題[微積] 一題高微
時間Fri May 20 07:44:13 2011
題目是 ∞
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.
可以幫忙解答嗎?
謝謝
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