Hi Robert,
On Mar 12, 8:42 am, Robert Bradshaw <[email protected]>
wrote:
> > So, why is the corresponding operation not done in the second example?
>
> Because the ordering of variables is ambiguous. Should it be QQ
> [a,x,x1,y1,z] or QQ[a,x1,x,y1,z]?
Good point, thank you!
> sage: R = QQ['a,b,c,d']
> sage: S = QQ['x,y,z']
>
> sage: all_vars = list(set(R.variable_names() + S.variable_names()))
> sage: PolynomialRing(R.base_ring(), all_vars)
> Multivariate Polynomial Ring in a, c, b, d, y, x, z over Rational Field
Ok, this is what I thought.
If there is no more direct / quicker way (some libsingular method that
I ignored) then I will do so.
Cheers,
Simon
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