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MathGroup Archive 1997

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Help with rules;

  • To: mathgroup at smc.vnet.net
  • Subject: [mg6014] Help with rules;
  • From: Gadi Oron <oron at tremois.pmmh.espci.fr>
  • Date: Tue, 11 Feb 1997 01:20:02 -0500
  • Organization: Acces regional Ile-de-France (Univ. Paris VI/VII) - France
  • Sender: owner-wri-mathgroup at wolfram.com

Hi there guys,

I'm using MM 2.2 under unix, 

I have this expression 
 
                2                3                      2
         Sqrt[c2  - 6 c4] Sqrt[c2  - 6 c2 c4] Sqrt[-2 c4  + 5 c2 c6] Pi
Out[56]= --------------------------------------------------------------
                                            2
                        Sqrt[2] c2 Sqrt[2 c4  - 5 c2 c6]
 
In[57]:= InputForm[%]
 
Out[57]//InputForm= 
  ((c2^2 - 6*c4)^(1/2)*(c2^3 - 6*c2*c4)^(1/2)*(-2*c4^2 + 5*c2*c6)^(1/2)*Pi)/
   (2^(1/2)*c2*(2*c4^2 - 5*c2*c6)^(1/2))

And i want to simplify it by replacing Sqrt[-2 c4^2 - 5 c2 c6]/Sqrt[-the 
same] by I,

How come :

% /. Sqrt[x_]/Sqrt[-x]-> I does not work ??!!

Help!!!

Thanx 

/\/\/\/\/\/\/\/\/\/\/\/>> Gadi ORON <<\/\/\/\/\/\/\/\/\/\/\/\/\
| EMAIL :  oron at pmmh.espci.fr   ::::     oron at clipper.ens.fr  |
| Homepage : http://pmmh.espci.fr/home/oron/WWW/personal.html |
| fido : 2:325/302.8                                          |
| 		  Soyez braves - be brave.                    |
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