Groups > comp.soft-sys.math.mathematica > #1573

Re: from Rumen, MEXICO, petition

From	Bill Rowe <readnews@sbcglobal.net>
Newsgroups	comp.soft-sys.math.mathematica
Subject	Re: from Rumen, MEXICO, petition
Date	2011-04-09 21:59 +0000
Organization	Steven M. Christensen and Associates, Inc and MathTensor, Inc.
Message-ID	<inqks2$e63$1@smc.vnet.net> (permalink)

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On 4/9/11 at 7:11 AM, rumen5252@yahoo.com.mx (Rumen Ivanov) wrote:

>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.

There is no solution. Each of the terms in your expression has
the form a*Exp[-Es/b] with a and b being positive reals. So,
each term is a positive real for all real values of Es. Your
expression has a global minimum value of 2.02912 at Es =
+Infinity and increases to +Infinity as Es tends to -Infinity.

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Re: from Rumen, MEXICO, petition Bill Rowe <readnews@sbcglobal.net> - 2011-04-09 21:59 +0000

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