Re: Reduce/Solve
- 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: <cetf3i$6i8$1@smc.vnet.net>
- Sender: owner-wri-mathgroup at wolfram.com
When you use Solve on your problem you get a warning message about multivalues inverses. 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. Steve Luttrell "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 5.0.0.0 under Windows XP. > > Tony > > 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 > LONDON > WC1E 6BT > (44)(0)207 679 3404 > a.harker at ucl.ac.uk > > >