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problem with Sum

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  • Subject: [mg100631] problem with Sum
  • From: olfa <olfa.mraihi at>
  • Date: Wed, 10 Jun 2009 05:31:11 -0400 (EDT)

Hi mathematica community,

I have this input: Sum[a[k], {k, 1, j}] - Sum[a[k], {k, 1, i+j-n}]
How it is possible to let mathematica gives as output:
Sum[a[k], {k, i+j-n+1, j}] if i+j-n<j
and Sum[a[k], {k, j+1, i+j-n}] if i+j-n>j

thank you very much.

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