> PolyBoRi is automatically used by Sage for GB computations?

If you construct a BooleanPolynomialRing. See

http://www.sagemath.org/hg/sage-main/file/b0aa7ef45b3c/sage/rings/polynomial/pbori.pyx

> On the other hand I calculated my new ideal and I wonder why it takes
> so long for SAGE to evaluate just the ideal and not to compute the GB.
> As I said in my previous posts, I only introduced the ideal, pressed
> evaluate, waited all night long and nothing. So I didn't even got in
> to the GB computation phase.
>
> Is this normal?

No, it should be instant. I assume you're talking about the call

B.ideal([x1*x2 + ..., x2 + ..., ...]) ?

> And another last question: should I use SAGE via web or installe it on
> my system? Which one do you think is faster? Does it matter?

If you run a potentially large calculation it is better *not* to use the 
public notebook:
 * the public notebook is for evaluating Sage and not for serious research.
 * it might put a strain on the system which would be not nice for the other 
users of the public notebook
 * there is no guarantee that the server won't be rebooted while your 
calculation is running
 * there is no guarantee that your data is preserved, although we try.

Cheers,
Martin

-- 
name: Martin Albrecht
_pgp: http://pgp.mit.edu:11371/pks/lookup?op=get&search=0x8EF0DC99
_otr: 47F43D1A 5D68C36F 468BAEBA 640E8856 D7951CCF
_www: http://www.informatik.uni-bremen.de/~malb
_jab: martinralbre...@jabber.ccc.de


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