MathGroup Archive: July 2006 [00322]

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Re: RE:How to get a positive solution from Solve Command

To: mathgroup at smc.vnet.net
Subject: [mg67890] Re: RE:How to get a positive solution from Solve Command
From: "Borut Levart" <BoLe79 at gmail.com>
Date: Wed, 12 Jul 2006 05:05:14 -0400 (EDT)
References: <e8ntae$k8p$1@smc.vnet.net>
Sender: owner-wri-mathgroup at wolfram.com

Below are two lines of code.
Just modify the # in the second line to: (# /. c -> 0.5). This will
alow Select to pick among numerical values, and it will pick the right,
positive one.

Bye
Borut Levart

abdou.oumaima at hotmail.com wrote:
> I find this solution but doesn't suit me well,
> f[&#958;_] := Normal[Series[1 - c  ArcTanh[&#958;]/&#958;, {&#958;, 0, 2}]]
> Select[&#958; /. Solve[f[&#958;] == 0, &#958;], # > 0 &]
>
> the output is {} it gives me anything!
> Is there any solution for that? :-(

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