       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*
(1/2 - 1/(2*(-7 + 4*Sqrt)^2))*
(((-384 + 224*Sqrt)*(3/2 + 2*Sqrt +
1/(2*(-7 + 4*Sqrt))))/(-(1/2) +
1/(2*(-7 + 4*Sqrt)^2)))^(3/2);

Simplify[expr]
1/%

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

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

David Park

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

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

Sincerely. Arturas Acus

```

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