I'm the originator. In fairness to Jan, I must say that I only showed him the code and output with no other comment than that I hoped that the students would not ask me to explain it.
I've in the meantime found a way of illustrating the point I meant to make more clearly. sage: z=1.+sqrt(-1) sage: base_ring(z) Symbolic Ring sage: base_ring(real(z)) Symbolic Ring sage: base_ring(imag(z)) Real Field with 53 bits of precision Dirk --~--~---------~--~----~------------~-------~--~----~ To post to this group, send an email to sage-devel@googlegroups.com To unsubscribe from this group, send an email to sage-devel-unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-devel URLs: http://www.sagemath.org -~----------~----~----~----~------~----~------~--~---
