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MathGroup Archive 2000

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Re: Product with p!=j

  • To: mathgroup at smc.vnet.net
  • Subject: [mg21705] Re: [mg21683] Product with p!=j
  • From: "Tomas Garza" <tgarza at mail.internet.com.mx>
  • Date: Sat, 22 Jan 2000 02:53:19 -0500 (EST)
  • Sender: owner-wri-mathgroup at wolfram.com

guillerm at gugu.usal.es wrote:

> I have the following problem:
> 
> q[n_]:= Sum[1/Product[Subscript[k, p] - Subscript[k, j], {p, 1, 
> n}], {j, 1, n}], with p!=j
> 
> Any suggestions?.

Perhaps this will help:

In[1]:=
d[p_, j_] := If[p != j, 1/(Subscript[k, p] - Subscript[k, j]), 1]

In[2]:=
q[n_] = Sum[Product[d[p, j], {p, 1, n}], {j, 1, n}]

Tomas Garza
Mexico City


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