[R] (Off topic) Limit question.

From: Rolf Turner <rolf_at_math.unb.ca>
Date: Thu 22 Sep 2005 - 07:35:24 EST


Please reply to me directly (rolf@math.unb.ca) rather than to the list, since the question is completely R-free and I'm simply asking this list because there are so many clever and knowledgeable people on it.

Suppose that n_i, i = 1, 2, 3, ... are positive integers, and that

                      k
	  lim        SUM n_i^j = nu_j < infinity
     k --> infinity  i=1

for j = 1, 2, 3. Need it be the case that

                     k-1
	  lim        SUM n_i * n_{i+1}     exists?
     k --> infinity  i=1

I can neither prove this, nor come up with a counter-example. Can anyone help me out?

                                cheers,

                                        Rolf Turner



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https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html Received on Thu Sep 22 07:38:38 2005

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