Here's another useful one:
any($x) eqv all($x) eqv one($x) eqv $x
but:
none($x) !eqv $x
That is, applying any, all, or one to a one-item list produces the
equivalent to a single item. For an empty list: any() eqv all() eqv
(). But what about one() and none()?
--
Jonathan "Dataweaver" Lang
