Assume that f(x) belong to C^1 and for n≧0,
oo
lim (x^n)*f(x) =0 , lim (x^n)*∫ f(t)dt = 0
x→∞ x→∞ x
Prove or disprove
lim (x^(n+1))*f(x) =0
x→∞
證不出來又找不到反例...
請教各位高手了
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