Hi. I'm using this polynomial: p = z*x^2 + x^2 − (x^2 + y^2 )*(a*x − 2*b*y) + z*y^2 + y^2
and when I issue this command: p.collect(x).collect(y) to Sage 8.3 in the terminal, I get this response: -a*x^3 + 2*b*x^2*y + 2*b*y^3 - (a*x - z - 1)*y^2 + x^2*z + x^2 Notice that only y is collected. Here is the results from p.collect(x): -a*x^3 - a*x*y^2 + 2*b*y^3 + (2*b*y + z + 1)*x^2 + y^2*z + y^2 X is collected OK. Here's p.collect(y) -a*x^3 + 2*b*x^2*y + 2*b*y^3 - (a*x - z - 1)*y^2 + x^2*z + x^2 Y is collected OK. But put them both together p.collect(x).collect(y): -a*x^3 + 2*b*x^2*y + 2*b*y^3 - (a*x - z - 1)*y^2 + x^2*z + x^2 And only y is collected! Would you please tell me how to fix this? Thank you. -- You received this message because you are subscribed to the Google Groups "sage-support" group. To unsubscribe from this group and stop receiving emails from it, send an email to sage-support+unsubscr...@googlegroups.com. To post to this group, send email to sage-support@googlegroups.com. Visit this group at https://groups.google.com/group/sage-support. For more options, visit https://groups.google.com/d/optout.
