The difference I see as fundamental is on the Empty set. Whereas in the previous proposal we got the following results.
$Empty ps Empty |length error: ps | ps Empty In the current proposal we get the following results. $Empty 0 ps Empty ┌┐ ││ └┘ In both proposals a difficulty arises with the execution of the following instruction because a set with the sole element "blank" is different from Empty. But I don't know a remedy. set <'' -- (B=) ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
