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Re: from Rumen, MEXICO, petition

  • To: mathgroup at smc.vnet.net
  • Subject: [mg118065] Re: from Rumen, MEXICO, petition
  • From: Barrie Stokes <Barrie.Stokes at newcastle.edu.au>
  • Date: Mon, 11 Apr 2011 07:06:23 -0400 (EDT)

Hi Rumen

The results from

expression = 
 11*Exp[-Es/135] + 10.5*Exp[-Es/425] + 4.899*Exp[-Es/1754] + 2.02912;
Plot[ expression, {Es, 0, 10000}, PlotRange -> {All, {-10, All} }, 
 Epilog -> {Line[ {{0, 0}, {10000, 0}} ]}]
Limit[ expression, Es -> \[Infinity] ]

and casual inspection suggest that this expression is never zero?

Cheers

Barrie

>>> On 09/04/2011 at 9:11 pm, in message <201104091111.HAA09139 at smc.vnet.net>,
Rumen Ivanov <rumen5252 at yahoo.com.mx> wrote:
> Hello, 
> 
> 11*Exp[-Es/135]+10.5*Exp[-Es/425]+
> 4.899*Exp[-Es/1754]+ 2.02912  = 0
> Please tell me how Mathematica can solve this equation
> for Es? With the derivatives of "Solve" it is impossible.
> 
> Best
> 
> Regards,
> 
> Rumen
> 
> Prof. Dr. Rumen Ivanov Tsonchev 
> Facultad de F=EDsica 
> Universidad Aut=F3noma de Zacatecas 
> e-mail=B4s:
> rumen5252 at yahoo.com.mx 
> rumen at fisica.uaz.edu.mx



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