ABSTRACT

Thus V2 C Vi. V3,V4 £ Vi as 19 E V3,VA but 19 $ V2. Hence V3, V4 £ V i · Vi £ V2 as 1 / 2 € Vi but 1 / 2 £ V2. Vi £ V3 ,V4 as 0 E Vi but 0 £ V3, V4. V3 C V4 but V4 £ V 3 as 2 £ V4 but 2 £ V 3.