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MathGroup Archive 2004

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RE: Bug in parsing expression?

  • To: mathgroup at smc.vnet.net
  • Subject: [mg49104] RE: [mg49062] Bug in parsing expression?
  • From: "David Park" <djmp at earthlink.net>
  • Date: Thu, 1 Jul 2004 05:25:56 -0400 (EDT)
  • Sender: owner-wri-mathgroup at wolfram.com

Arturas,

Definitely the same problem with Version 5.0.0 on Windows98. It's a bug.

But working with the denominator first...

expr = 5*(-7 + 4*Sqrt[3])^3*
    (1/2 - 1/(2*(-7 + 4*Sqrt[3])^2))*
    (((-384 + 224*Sqrt[3])*(3/2 + 2*Sqrt[3] + 
        1/(2*(-7 + 4*Sqrt[3]))))/(-(1/2) + 
       1/(2*(-7 + 4*Sqrt[3])^2)))^(3/2); 

Simplify[expr]
1/%

-1280*I*Sqrt[56451 - 32592*Sqrt[3]]*(-7 + 4*Sqrt[3])*
  (-97 + 56*Sqrt[3])

I/(1280*Sqrt[56451 - 32592*Sqrt[3]]*(-7 + 4*Sqrt[3])*
   (-97 + 56*Sqrt[3]))

David Park
djmp at earthlink.net
http://home.earthlink.net/~djmp/ 


From: Arturas Acus [mailto:acus at itpa.lt]
To: mathgroup at smc.vnet.net


Dear Group,

Just try to evaluate this expression 

1/(5*(-7 + 4*Sqrt[3])^3*(1/2 - 1/(2*(-7 + 4*Sqrt[3])^2))*(((-384 +
224*Sqrt[3])*(3/2 + 2*Sqrt[3] + 1/(2*(-7 + 4*Sqrt[3]))))/(-1/2 +      
1/(2*(-7 + 4*Sqrt[3])^2)))^(3/2))

in 5.0. on linux box I receive   $IterationLimit::"itlim" message.
Is it repeatable?

Sincerely. Arturas Acus




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