arb agrees here: sage: CBF(1/2).legendre_P(1,1) [-0.8660254037844386 +/- 5.90e-17]
So I'd suggest using complex balls for your numerics until the bug is fixed. Thanks, P.S. Still someone should contact DLMF with the right arguments. -- You received this message because you are subscribed to the Google Groups "sage-devel" group. To unsubscribe from this group and stop receiving emails from it, send an email to sage-devel+unsubscr...@googlegroups.com. To post to this group, send email to sage-devel@googlegroups.com. Visit this group at https://groups.google.com/group/sage-devel. For more options, visit https://groups.google.com/d/optout.
