Re: from Rumen, MEXICO, petition
- To: mathgroup at smc.vnet.net
- Subject: [mg118044] Re: from Rumen, MEXICO, petition
- From: Bill Rowe <readnews at sbcglobal.net>
- Date: Sat, 9 Apr 2011 17:59:22 -0400 (EDT)
On 4/9/11 at 7:11 AM, rumen5252 at 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.