       Re: Solve equation with summation?

• To: mathgroup at smc.vnet.net
• Subject: [mg122998] Re: Solve equation with summation?
• From: Ralph Dratman <ralph.dratman at gmail.com>
• Date: Sun, 20 Nov 2011 05:35:14 -0500 (EST)
• Delivered-to: l-mathgroup@mail-archive0.wolfram.com
• References: <ja5f56$69e$1@smc.vnet.net>

I see the discrepancy on my copy of 8.0.4 too.

Ralph

On Sat, Nov 19, 2011 at 6:48 AM, Bob Hanlon <hanlonr357 at gmail.com> wrote:
> Not with my version
>
> $Version > > "8.0 for Mac OS X x86 (64-bit) (October 5, 2011)" > > Solve[Sum[Subscript[a, i], {i, 1, n}]/x == 1, x] > > {{x -> Sum[Subscript[a, i], {i, 1, n}]}} > > Solve[Sum[Subscript[a, i]/x, {i, 1, n}] == 1, x] > > {} > > > Bob Hanlon > > > On Fri, Nov 18, 2011 at 7:50 AM, Dr. Wolfgang Hintze <weh at snafu.de> wrote: >> 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?
>>>
>
>



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