>
> Fails with:
>
> AttributeError: 'sage.rings.polynomial.pbori.BooleanPolynomialRing' object has
> no attribute 'Ideal'
>
> after fixing that it works in < 20 seconds (inkl. Sage startup).
>


I never got this message because after introducing the ideal, it keeps
thinking and never ending. I don' t know why this happens. Anyway, if,
despite of this, I try to compute the groebner base by the call
I.groebner_basis()  I get an error  AttributeError: 'I_class' object
has no attribute 'groebner_basis'.

Can you tell me when do you obtain that error you mentioned how do you
fix it?

I don't understand what happens, why I get different messages.

Thank you very much for helping!
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