> > this asymmetry between true and false seems bad. shouldn't "is_true(x) > == is_false(!x)" always be true? >
Depends on whether or not you're talking to a SQL person. I think is_true(x) == is_false(!x) should either be true or inconclusive. - Rhys --~--~---------~--~----~------------~-------~--~----~ To post to this group, send email to sage-support@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/sage-support URLs: http://www.sagemath.org -~----------~----~----~----~------~----~------~--~---