"i" is sqrt(-1), which sage seems usually to realize without being told. Anyway there is no "i" in my first post on the resultant, and also I get the same error with "CC" in place of "QQ".
On Jan 31, 3:38 pm, William Stein <wst...@gmail.com> wrote: > 2010/1/31 Michael Beeson <profbee...@gmail.com>: > > > another failed attempt to compute a resultant, that doesn't involve > > any quotient fields: > > > sage: R.<z,p,e,d,f,g,h,r,l,m>=QQ[] > > sage: F = i*m*z^14 + (d+g)*z^13 + i*(f-p)*z^12 + e*z^11 + i*f*z^10 + > > (e-g)*z^9 + i*(m+p)*z^8 + 2*d*z^7 - i*(m+p)*z^6 + (e-g)*z^5 -i*f*z^4 + > > e*z^3 - i*(f-p)*z^2 + (d+g)*z - i*m > > What is "i" above? It's not an element of R. Did you forget to > define it? Or do you really want sqrt(-1)... in which case you should > replace QQ by a quadratic number field. > > > > > > > sage: G = d*z^16 - (l+i*p)*z^15 + (e+i*h)*z^14 - r*z^13 + e*z^12 - (r > > - i*p)*z^11 + (d-i*h)*z^10 - l*z^9 + l*z^7 - (d + i*h)*z^6 + (r+i*p) > > *z^5 - e*z^4 + r*z^3 - (e-i*h)*z^2 + (l-i*p)*z -d > > sage: F.resultant(G) > > --------------------------------------------------------------------------- > > AttributeError Traceback (most recent call > > last) > > > /Users/beeson/<ipython console> in <module>() > > > AttributeError: 'sage.symbolic.expression.Expression' object has no > > attribute 'resultant' > > > and I get the same result with "CC" in place of "QQ" > > > -- > > To post to this group, send email to sage-support@googlegroups.com > > To unsubscribe from this group, send email to > > sage-support+unsubscr...@googlegroups.com > > For more options, visit this group > > athttp://groups.google.com/group/sage-support > > URL:http://www.sagemath.org > > -- > William Stein > Associate Professor of Mathematics > University of Washingtonhttp://wstein.org -- To post to this group, send email to sage-support@googlegroups.com To unsubscribe from this group, send email to sage-support+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-support URL: http://www.sagemath.org
