=+For all a E [0,1] and Vx, y E V, let aTx denote (aTal . . . . , aTan), where x = (a,, .an) and let x V y denote (al V bl . . . . , an V bn), where y = (bl, . . . , bn ) . Define the function C : 'P (V) ~ 'P(V) by VX E 'P (V),