
theorem Th17:
  for X being set holds field Dependencies-Order X = [: bool X, bool X :]
proof
  let X be set;
  thus field Dependencies-Order X = dom Dependencies-Order X\/rng
  Dependencies-Order X by RELAT_1:def 6
    .= [: bool X, bool X :]\/rng Dependencies-Order X by Th15
    .= [: bool X, bool X :]\/[: bool X, bool X :] by Th16
    .= [: bool X, bool X :];
end;
