Is this a bug? First example is from Judson's abstract algebra text. Note that ".is_unit()" returned "True" in sage 4.8.
sage: sage: K.<x,y> = ZZ[sqrt(-3)]; K Order in Number Field in a with defining polynomial x^2 + 3 sage: four = K(4) sage: four.is_unit() False sage: four^-1 1/4 Second example: all but the last input is basically from the documentation of ".is_unit()." sage: K.<a> = NumberField(x^2 - x - 1) sage: OK = K.ring_of_integers() sage: u = OK(13) sage: u.is_unit() False sage: u^-1 1/13 Thanks, Rob -- -- 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
