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Problem understanding divergence test

  1. Nov 11, 2006 #1
    I am going through Boas.Ch-1.on infinite series.
    Can anyone help?
    1.May we use preliminary divergence test for series with +ve and -ve terms?How?For some situation occurs when we are supposed to make out (-1)^infinity
  2. jcsd
  3. Nov 11, 2006 #2
    I am sorry, but you are going to need to be a little more specific about your problem. Recall from your Calculus courses that there a number of different divergence/convergence tests for infinite series.
  4. Nov 11, 2006 #3
    Re divergence test

    It says limit a#n as n tends to infinity when not equal to zero, the series diverges.And as a#n tends to zero as n tends to infinity is inconclusive.I want to know, whether a#n may be negative numbers.
  5. Nov 11, 2006 #4
    Infinite series use [tex]n[/tex] to denote the number of the term in the series, you cannot of a 'negative' term (that I know of) in a series. I am not even sure what you are asking though.
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