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MathGroup Archive 2011

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Bug in Sum?

  • To: mathgroup at smc.vnet.net
  • Subject: [mg119903] Bug in Sum?
  • From: Dario <dario.benedetti at aei.mpg.de>
  • Date: Wed, 29 Jun 2011 05:27:27 -0400 (EDT)

I am very puzzled by the fact that Mathematica does not evaluate the following Sum (it keeps running endlessly):

Sum[1/(n  (1 + n)) 1/((1 - x)^4) , {n, 1, M}]

where x and M are some undefined variables,

but it does evaluate

Sum[1/(n  (1 + n)) 1/((1 - x)^2) , {n, 1, M}]

where I have only changed the power of (1-x), which should not matter as it must factor out!

Any help on this please?


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