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MathGroup Archive 2006

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Re: Re: unable to FullSimplify

  • To: mathgroup at smc.vnet.net
  • Subject: [mg65908] Re: Re: unable to FullSimplify
  • From: "Dana DeLouis" <ddelouis at bellsouth.net>
  • Date: Sat, 22 Apr 2006 04:54:34 -0400 (EDT)
  • Sender: owner-wri-mathgroup at wolfram.com

> FullSimplify[Expand[x + (x + x^2)^4] 

>   /. x -> y - 1] /. y -> x + 1

 

A slightly different idea might be to 'remove'  a part

 

Here are the 3 problem equations:

 

e1 = Expand[a + (a + b)^4]; 

e2 = Expand[x + (x + x^2)^4]; 

e3 = Expand[x + (x + x^2)^ 16]; 

 

(* This doesn't do much at all...*)

 

FullSimplify /@ {e1, e2, e3}; 

 

(* This helps a little *)

 

FullSimplify[e1 - a] + a

 

a + (a + b)^4

 

FullSimplify[e2 - x] + x

 

x + x^4*(1 + x)^4

 

FullSimplify[e3 - x] + x

 

x + x^16*(1 + x)^16

 

Interesting subject.

Dana



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