Beginner--How to get a positive solution from Solve Command
- To: mathgroup at smc.vnet.net
- Subject: [mg67791] Beginner--How to get a positive solution from Solve Command
- From: abdou.oumaima at hotmail.com
- Date: Fri, 7 Jul 2006 07:13:42 -0400 (EDT)
- Sender: owner-wri-mathgroup at wolfram.com
Hello mathgroup,
I'm trying to solve and equation in a limit case, so I've to use Taylor series.
In[1]: Normal[Series[1 - c ArcTanh[ξ]/ξ, {ξ, 0, 2}]]
Out[1]: 1-c-c (ξ^2/3)
and
In[2]: Solve[%==0,ξ]
Out[2]: {{ξ->- (3(1-c)/ξ)^1/2},{ξ->(3(1-c)/ξ)^1/2}}
I need just the positive solution. How to force Solve to give me the positive value please.
Any Help please.
Thank you
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