Re: Simplify

*To*: mathgroup at smc.vnet.net*Subject*: [mg28631] Re: Simplify*From*: Jens-Peer Kuska <kuska at informatik.uni-leipzig.de>*Date*: Thu, 3 May 2001 04:28:22 -0400 (EDT)*Organization*: Universitaet Leipzig*References*: <9cfrf2$gm1@smc.vnet.net>*Sender*: owner-wri-mathgroup at wolfram.com

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