I changed the decimals into fractions and I confirm that I am now getting 
results. Thank you so much for your help. You saved me out of stress and 
depression.

Best Regards,

On Tuesday, February 18, 2014 11:23:37 AM UTC-5, Martin R. Albrecht wrote:
>
>
>
> On 18/02/14 14:31, sahi...@gmail.com <javascript:> wrote: 
> > TypeError: unsupported operand parent(s) for '*': 'Real Field with 
> > 53 bits of precision' and 'Multivariate Polynomial Ring in x1, x2, 
> > x3, x4, x5, x6, x7, x8 over Number Field in I with defining 
> > polynomial x^2 + 1' 
>
> This means that you are mixing elements from 
>
>  * the 'Real Field with 53 bits of precision' and 
>  * 'Multivariate Polynomial Ring in x1, x2, x3, x4, x5, x6, x7, x8 over 
> Number Field in I with defining polynomial x^2 + 1' 
>
> which you shouldn't do. In particular: 
>
>    3.5*x2 
>
> is your problem. Replace 3.5 by 7/2 and you are good to go. 
>
> Cheers, 
> Martin 
>
> PS: Those error messages are meant to be helpful regardless of how scary 
> they might look :) You can also try to reduce your input in order to 
> figure out which part exactly triggers the error. 
>
>

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