[分析]log(n) 是 Cauchy sequence嗎?

[unknow12 (LockOn)]

根據定義sequence(Xn)is Cauchy Sequence if every ε>0
there is a nature number N , such that |Xm-Xn|<ε for all m,n>=N

那Xn=log(n)
有|X(n+1)-Xn|=log((1+n)/n)→0  as n→∞
滿足cauchy的條件阿
為什麼答案不是cauchy



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