2. From preferences to utility Continuity: V(r",yin=,x% y, and x=limx,y=limy then x% y, or x upper contour sets x: y% x) and lower contour sets (yeX: x% y, are closure Proposition2: If% is continuous then exist a continuous utility function representing2.From preferences to utility • Continuity: then ,or x upper contour sets and lower contour sets are closure. • Proposition2:If is continuous, then exist a continuous utility function representing . 1 { , } , ,and lim , lim n n n n n n n n n x y x y x x y y  = → →  = = % x y % {:} y y x  X % {:} y x y  X % % %