Comment #7 on issue 886 by Vinzent.Steinberg: simplify for general functions and derivatives fails http://code.google.com/p/sympy/issues/detail?id=886
Another bug: In [10]: z Out[10]: 2 d ─────(f(x))⋅f(x) dx dx ──────────────── 2 d ──(f(x)) dx In [11]: z.subs(f(x), 0) Out[11]: nan But simplification works much better now: In [13]: simplify(z.diff(x)) Out[13]: 2 2 2 2 3 d d d d d ──(f(x)) ⋅─────(f(x)) - 2⋅─────(f(x)) ⋅f(x) + ──(f(x))⋅────────(f(x))⋅f(x) dx dx dx dx dx dx dx dx dx ────────────────────────────────────────────────────────────────────────── 3 d ──(f(x)) dx -- You received this message because you are listed in the owner or CC fields of this issue, or because you starred this issue. You may adjust your issue notification preferences at: http://code.google.com/hosting/settings --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "sympy-issues" group. To post to this group, send email to sympy-issues@googlegroups.com To unsubscribe from this group, send email to sympy-issues+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sympy-issues?hl=en -~----------~----~----~----~------~----~------~--~---