I think it is of doubtful correctness RR not being closed under coercion: sage: RR(RR(-1)^(1/3)) TypeError: unable to convert '0.500000000000000+0.866025403784439*I' to a real number
"closed under coercion" sounds vague to me. I doubt if there is such a concept in sage. Fractional powers not being closed is a python thing, which is inherited to sage: >>> (-1)**(1/3) (0.5000000000000001+0.8660254037844386j) -- 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 view this discussion on the web visit https://groups.google.com/d/msgid/sage-devel/25c746a4-e0de-4b12-a7b9-0abc1de0b3e4n%40googlegroups.com.
