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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
>
>
>