Comment #10 on issue 2049 by smichr: Derivative(f(x), x).subs(f(x), y) gives 0 instead of Derivative(y, x)
http://code.google.com/p/sympy/issues/detail?id=2049
rebased on master. I put in a pull request. -- You received this message because you are subscribed to the Google Groups "sympy-issues" group. To post to this group, send email to sympy-iss...@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.