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5.2.3. Cauchy sign
Lecture
Let a positive number series be given. If there is a final limit 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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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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