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normalization and square roots

• To: mathgroup at smc.vnet.net
• Subject: [mg65739] normalization and square roots
• From: wtplasar at ehu.es
• Date: Sun, 16 Apr 2006 03:49:18 -0400 (EDT)
• Sender: owner-wri-mathgroup at wolfram.com

[This post has been delayed due to email problems - moderator]



I have this function

f[x_, om_, oro_] := 1/(Sqrt[oro] - Sqrt[om(1 + x)^3 + ol + oro]) /. 
ol -> myrule

and I want to define a rule (myrule) so that 

f[0,om,or0]=1

If I set 

myrule=-om + (-1 + Sqrt[oro])^2 - oro;

then it works find when I do not give numerical values to om and oro.

For instance, if I evaluate f[0,a,b] I get 1, but if I evaluate
f[0,0.3,0.4] I get 3.77485. I think it is just because it is not taking
the right which is convenient for me.

Can you help me?

Thanks,

Ruth