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5.2.2. Sign of dalamber
Lecture
If in the series with positive terms the ratio of ( n +1) -th member to the n -th with has a limit of l , i.e. then, for l > 1, the row diverges, for l <1, the row converges, for l = 1, the series can either converge or diverge.
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has a limit of l , i.e. 
then, for l > 1, the row diverges, for l <1, the row converges, for l = 1, the series can either converge or diverge. 
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