Re: Cancel[] and finite symbolic sums ?
- To: mathgroup at smc.vnet.net
- Subject: [mg102802] Re: [mg102763] Cancel[] and finite symbolic sums ?
- From: Bob Hanlon <hanlonr at cox.net>
- Date: Thu, 27 Aug 2009 06:37:36 -0400 (EDT)
- Reply-to: hanlonr at cox.net
s = Sum[W*Subscript[b, k], {k, 1, N}];
To divide each term by W:
s /. Sum[x_, iter_] :> Sum[x/W, iter]
Sum[Subscript[b, k], {k, 1, N}]
Bob Hanlon
---- Andre Holzner <andre.holzner at gmail.com> wrote:
=============
Dear experts,
I wonder what I'm doing wrong here...
I try to simplify the following expression: [Sum[W * Subscript[b, k],
{k, 1, N}]/W
by doing
Cancel[Sum[W * Subscript[b, k], {k, 1, N}]/W]
it looks like Mathematica just returns me the original expression: Sum
[W*Subscript[b, k], {k, 1, N}]/W
When I try a sum over b instead of Subscript[b, k], it seems to work
as expected:
Cancel[Sum[W * b, {k, 1, N}]/W]
gives:
b*N
Any ideas what I'm doing wrong ?
thanks,
Andre