Hi, It is because f is not separable. If you see the documentation, places() method is supported only for global function fields, and global function fields in sage are separable extensions of rational function fields (over finite fields). You may use a separable model of L instead.
sage: Ls, from_Ls, to_Ls = L.separable_model() sage: Ls.places() [Place (1/x_, 1/x_*y_ + 1), Place (x_, y_), Place (x_, y_ + 1)] Kwankyu -- You received this message because you are subscribed to the Google Groups "sage-support" group. To unsubscribe from this group and stop receiving emails from it, send an email to sage-support+unsubscr...@googlegroups.com. To post to this group, send email to sage-support@googlegroups.com. Visit this group at https://groups.google.com/group/sage-support. To view this discussion on the web visit https://groups.google.com/d/msgid/sage-support/eae5bced-636b-43e9-9e02-6372cb0612f4%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
