Re: from Rumen, MEXICO, petition
- To: mathgroup at smc.vnet.net
- Subject: [mg118071] Re: from Rumen, MEXICO, petition
- From: Noqsi <noqsiaerospace at gmail.com>
- Date: Mon, 11 Apr 2011 07:07:29 -0400 (EDT)
- References: <inpeua$8ul$1@smc.vnet.net>
On Apr 9, 5:12 am, Rumen Ivanov <rumen5... 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.
As others have pointed out, it has no real solutions. But it appears
to have many complex solutions:
f=11*Exp[-Es/135]+10.5*Exp[-Es/425]+4.899*Exp[-Es/1754]+2.02912
FindRoot[f==0,{Es,500I}]
{Es->-55.0724+546.446 I}
FindRoot[f==0,{Es,2000I}]
{Es->81.4202+2009.63 I}