Re: Solve equation with summation?

*To*: mathgroup at smc.vnet.net*Subject*: [mg122960] Re: Solve equation with summation?*From*: "Dr. Wolfgang Hintze" <weh at snafu.de>*Date*: Fri, 18 Nov 2011 07:50:03 -0500 (EST)*Delivered-to*: l-mathgroup@mail-archive0.wolfram.com*References*: <ja5f56$69e$1@smc.vnet.net>

Sorry, but with me both expressions (exactly copied from your message) give the same result. Regards, Wolfgang "Ivan" <iveney at gmail.com> schrieb im Newsbeitrag news:ja5f56$69e$1 at smc.vnet.net... > For a summation like \sum_{i=1}^n a_i/x = 1, > > Solve[Sum[Subscript[a, i], {i, 1, n}]/x == 1, x] > > gives a correct solution. > > However, by putting x into the summation: > > Solve[Sum[Subscript[a, i]/x, {i, 1, n}] == 1, x] > > > gives an empty set, why? >