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Science版 - Re: A mathematical Analysis Question
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g******a
发帖数: 69
1
if An>1 for all n, then An/(An+1)>1/2 for all n;
if An<=1 for n>=N, then An/(An+1)>An/2, by comparison test...
a*****s
发帖数: 6260
2
An收敛到零的话,必存在N,使得AN+1<3/2,则
AN/(AN+1)>AN*3/2,而Sum(An*3/2)发散,又已知
An>0,则Sum(An/(An+1))发散,证毕。
1 (共1页)
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