Kip, Yes, I agree with what you get. I am a little unsure of the meaning of `set <''` but I am guessing it means a set of a blank or non character, which is different from Empty, the empty set.
And so I suppose it might be worthwhile to make the point that all sets in your system, except the empty set, are boxed. And I think you do make that point, but it was a little hard for me to learn. I think I prefer the newer system, so far. -- (B=) ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
