- To: mathgroup at smc.vnet.net
- Subject: [mg49930] Re: Reduce/Solve
- From: "Steve Luttrell" <steve_usenet at _removemefirst_luttrell.org.uk>
- Date: Fri, 6 Aug 2004 03:09:55 -0400 (EDT)
- References: <email@example.com>
- Sender: owner-wri-mathgroup at wolfram.com
When you use Solve on your problem you get a warning message about
However, the documentation on Reduce says: " The result of Reduce[expr,
vars] always describes exactly the same mathematical set as expr. "
Maybe Reduce wants to make absolutely sure it does what the documentation
says above, so it returns the expression unevaluated.
"Dr A.H. Harker" <a.harker at ucl.ac.uk> wrote in message
news:cetf3i$6i8$1 at smc.vnet.net...
> Dear All,
> I tend to think of Reduce as a more powerful tool than Solve,
> yet with
> eq = J == J0 (1 + r/d) Exp[-r/d]
> ss = Solve[eq, r]
> tt = Reduce[eq, r]
> I get useful output from Solve, but Reduce returns the expression
> unevaluated. What am I missing? Mathematica 22.214.171.124 under Windows XP.
> Dr A.H. Harker
> Director of Postgraduate Studies
> Deputy Head, Condensed Matter and Materials Physics Group
> Department of Physics and Astronomy
> University College London
> Gower Street
> WC1E 6BT
> (44)(0)207 679 3404
> a.harker at ucl.ac.uk
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