06/19/2009, 02:04 PM

"We call a region H an initial region of F iff F(z) {is not in} H for all z {in} H..."

does this mean (there is SOME z such that F(z) is NOT in H) or ) (there is NO z such that F(z) IS in H)?

does this mean (there is SOME z such that F(z) is NOT in H) or ) (there is NO z such that F(z) IS in H)?