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Re: Simplify


Denis Ubozhenko wrote:
> 
> Hallo, all
> 
> Please, tell me.
> How can i simplify this:
> 
> 1) Sum[b[k],{k,0,i-1}]+b[i] = = Sum[b[k],{k,0,i}]
> 2) (i<=5 or i>=6), i=Integers
> 
> deonis : deonis at farlep.dp.ua

Hi,

Sum[b[k], {k, 0, i}] /. 
  Sum[a_, {j_, 0, k_}] :> Sum[a, {j, 0, k - 1}] + (a /. (j -> k))

Regards
  Jens


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