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MathGroup Archive 1998

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Overriding default rules

  • To: mathgroup at smc.vnet.net
  • Subject: [mg13512] Overriding default rules
  • From: braynor at jupiter.kcc.com (Bill Raynor (B12349))
  • Date: Fri, 31 Jul 1998 04:33:27 -0400
  • Organization: Kimberly-Clark Corp.
  • Sender: owner-wri-mathgroup at wolfram.com

I need to work with sums and difference of terms like Sum[i^2/(a + b
i)^2, {i,0,n}]
which Mathematica immediately converts to polygamma's divided by a
function of b. 

How do I stop the conversion?
the function works just fine when b->0, but their reformulation does
not. Additionally, I want to expand and manipulate the series for small
values of n, which can't be done once its converted to PolyGamma.

Thanks

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