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Infinite Series Error - Bug?

  • To: mathgroup at
  • Subject: [mg124543] Infinite Series Error - Bug?
  • From: clashton <clashton at>
  • Date: Tue, 24 Jan 2012 05:06:02 -0500 (EST)
  • Delivered-to:

Can anyone explain why evaluating the following expression gives an

Sum[q^(-6 + 4*n)/(1 - q^(-5 + 4*n)), {n, 0, Infinity}] /. {q -> 0.1}

None of the denominators are 0 (would only happen if -5 + 4*n=0, which
is impossible for an integer n, yet I get an error message "Infinite
expression 1/0 encountered" (several times in fact).

Any help on a work around greatly appreciated.

(Please reply to my personal e-mail also).



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