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Re: Simplify stuck in simple expression
 To: mathgroup at smc.vnet.net
 Subject: [mg50143] Re: [mg50127] Simplify stuck in simple expression
 From: Bob Hanlon <hanlonr at cox.net>
 Date: Tue, 17 Aug 2004 05:01:24 0400 (EDT)
 Replyto: hanlonr at cox.net
 Sender: ownerwrimathgroup at wolfram.com
expr = (2Sqrt[72*(1+a*b)^2+4])/(2*a);
You can work around the problem by using a temporary change in variables
(x = a*b + 1)
Simplify[expr /. b> (x1)/a] /. x>a*b+1
or
Simplify[expr /. a> (x1)/b] /. x>a*b+1 // Cancel
Bob Hanlon
>
> From: carlos at colorado.edu (Carlos Felippa)
To: mathgroup at smc.vnet.net
> Date: 2004/08/16 Mon AM 06:45:34 EDT
> To: mathgroup at smc.vnet.net
> Subject: [mg50143] [mg50127] Simplify stuck in simple expression
>
> Hi  I wonder why
>
> Simplify[(2  Sqrt[72*(1+a*b)^2+4])/(2*a)];
>
> in v. 4.2 gets stuck. It does not reduce the expression to
>
> (1  Sqrt[18*(1+a*b)^2+1])/a;
>
> FullSimplify and declaringvariableattribute variations do not
> work. What is necessary for the simplification to happen?
>
>
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