Groups > comp.soft-sys.math.mathematica > #1588

Re: from Rumen, MEXICO, petition

From	Barrie Stokes <Barrie.Stokes@newcastle.edu.au>
Newsgroups	comp.soft-sys.math.mathematica
Subject	Re: from Rumen, MEXICO, petition
Date	2011-04-11 11:06 +0000
Organization	Steven M. Christensen and Associates, Inc and MathTensor, Inc.
Message-ID	<inunbb$2cg$1@smc.vnet.net> (permalink)

Show all headers | View raw

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@smc.vnet.net>,
Rumen Ivanov <rumen5252@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@yahoo.com.mx 
> rumen@fisica.uaz.edu.mx

Back to comp.soft-sys.math.mathematica | Previous | Next | Find similar | Unroll thread

Thread

Re: from Rumen, MEXICO, petition Barrie Stokes <Barrie.Stokes@newcastle.edu.au> - 2011-04-11 11:06 +0000

csiph-web