Trenchard More worked on a theory of nested arrays for a long time. For those interested you should google Trenchard More and Array Theory.
Trenchard More worked with Mike Jenkins for a long time on a language called Nial http://www.nial.com/ArrayTheory.html You can think of Trenchard More's work as a unification of APL, Lisp, and Set Theory. This influenced APL2. Some say that this caused "a schism" in the APL community. -David Leibs ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
