
theorem Th1:
  for f be non constant standard special_circular_sequence holds
  BDD L~f = RightComp f or BDD L~f = LeftComp f
proof
  let f be non constant standard special_circular_sequence;
  BDD L~f is_inside_component_of L~f by JORDAN2C:108;
  then BDD L~f is_a_component_of (L~f)` by JORDAN2C:def 2;
  hence thesis by JORDAN1H:24;
end;
