On Wednesday, October 31, 2012 9:39:11 AM UTC-7, V wrote:
>
> Hello,
>
> I try to execute one of the examples for computing the variety of a system 
> of Boolean polynomials from the Sage reference manual: 
>
> http://www.sagemath.org/doc/reference/sage/rings/polynomial/pbori.html
>
> and I get the error:
>
> [snip]

 

> I am using Sage version: 'Sage Version 4.8, Release Date: 2012-01-20' on a 
> 64-bit machine running Debian GNU/Linux.
>
>  
>

Your version of Sage is too old. That example in the reference manual was 
introduced in version 5.2 of Sage, so it doesn't work in version 4.8.

-- 
John

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