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?