After some testing I think the parent does not change (unless you get a constant in which case the parent becomes the groundfield). This is what I prefer.
Michel > Should the parent change though? For example, if you fix x in Q[x,y], > you now get a single-variate polynomial in y. --~--~---------~--~----~------------~-------~--~----~ To post to this group, send email to sage-devel@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/sage-devel URLs: http://sage.scipy.org/sage/ and http://modular.math.washington.edu/sage/ -~----------~----~----~----~------~----~------~--~---
