Local analysis ◆if S(xq)=SC∑x,∑9)=S(x) ◆ Because of C(g)=c(q1) ◆Then S(x)=l [p(s)-C(s)kLocal analysis if Because of Then 1 1 ( ) ( , ) ( ) I J i j i j S S x q S x = = x,q = =  ( ) ( ) C q c q i i   = 0 ( ) [ ( ) ( )] x S x p s C s ds = −  