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? >