On Sun, Feb 20, 2005 at 07:41:16PM +1100, Damian Conway wrote: Given this:
> my $x = set(1..3); > my $y = set(1,3,5,7,9); > my $n = 2; > > $x | $y # set(1,2,3,5,7,9) > $x & $y # set(1,3) > $x - $y # set(2) > !$x # set(none(2)) ;-) I don't understand this last line, even given the context of the preceding three. Why is it none of 2, rather than none of something else? Nicholas Clark
