Hi Joe, Wasn't that Aristotle's well-known definition? Marsha On Oct 6, 2012, at 3:07 PM, Joseph Maurer <jhmau at comcast.net> wrote: > To say of what is that it is not, or of what is not that it is, is false, > while to say of what is that it is, and of what is not that it is not, is > true. Metaphysics, 101 lb