Comment #5 on issue 3099 by smi...@gmail.com: Expr.is_constant() is very slow in some cases
http://code.google.com/p/sympy/issues/detail?id=3099
If you want to replace it with a faster XFAILing test you could use: assert simplify(x*polygamma(0, x + 1) - x*polygamma(0, x + 2) + polygamma(0, x + 1) - polygamma(0, x + 2) + 1) == 0 It's so slow because it's zero but evalf can never get any significant digits. But there are other faster failing tests already included so it's ok if this one gets changed. -- 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.
