I see, there is an inheritance chain QuotientRing_generic -> IntegerModRing_generic -> FiniteField_prime_modn
and they all circumvent the "official" coercion model. That at least explains why polynomials over finite fields break when changing QuotientRing_generic! Volker -- 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 URL: http://www.sagemath.org