Thanks, it seems to be what I need. Though I try to generate the
PolynomialRing slightly different and and this seems to cause problem in
using elimination_ideal() ....
sage: vs = var('x,y,z,A,B,k,i,j,m')
sage: R = PolynomialRing(QQ,vs)
sage: invs = [i*A+j*B-x,k*A+m*B-y,(i-k)*A+(j-m)*B-z]
sage: I = R*invs
sage: J=I.elimination_ideal([k,i,j,m,A,B])
TypeError .....
Any idea what was wrong ? I also posted the problem and the trace in
another post.
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