theorem
  M |= All(x,H) => H
proof
  let v;
  M,v |= All(x,H) implies M,v/(x,v.x) |= H by Th71;
  then M,v |= All(x,H) implies M,v |= H by FUNCT_7:35;
  hence thesis by ZF_MODEL:18;
end;
