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Re: not eliminating parameter

  • To: mathgroup at smc.vnet.net
  • Subject: [mg90219] Re: [mg90165] not eliminating parameter
  • From: Andrzej Kozlowski <akoz at mimuw.edu.pl>
  • Date: Wed, 2 Jul 2008 05:33:08 -0400 (EDT)
  • References: <200807011059.GAA14920@smc.vnet.net>

Eliminate does not use any numerical methods but only exact ones  
(GroebnerBasis) and works only with polynomials and expressions that  
can be reduced to polynomials by means of inverse functions.

Andrzej Kozlowski



On 1 Jul 2008, at 19:59, Narasimham wrote:

> Eliminate[ { x /c == Coth[x/c], y/c ==  Cosh[x/c]}, c ]
>
> It was expected with the first relation that x/c would be iterated in
> a FindRoot / NSolve mode to get a solution, say x/c = u, c = x/u
> leading to y/x = Cosh[u]/u by insertion into the second equation.
>
> But but there are no solutions, several &&s appear. I could have done
> the first one manually, but is   there some automatic way out?
>
> Thanks for indication.
>
> Narasimham
>



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