Hi, A short remark. It seems that taking the derivative of an element of a fraction field is not supported at this point. This feels somewhat inconsistent (tested with sage 2.10.4)
sage: R=QQ['x'] sage: x=R.gen() sage: derivative(x^2,x) 2*x sage: derivative(1/x,x) --------------------------------------------------------------------------- <type 'exceptions.TypeError'> Traceback (most recent call last) <snip> More fundamentally, I wonder if it makes sense to define the general concept of a derivation. Derivations are given by their values on generators so they fit well in the sage framework. The advantage of having abstract derivations would be that one could add them, take their commutatior etc.... Regards, Michel --~--~---------~--~----~------------~-------~--~----~ 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://www.sagemath.org -~----------~----~----~----~------~----~------~--~---
