equation icon  integral V~ ------ SIF[g + h± ] = 1- d4x - g(x)<^Tab[g;x)>[hab(x)] 2 integral 1 4 4 V~ ------ V~ ------ ( abcd abcd ) - -- d xd y - g(x) -g(y) [hab(x)] H [g;x, y) + K [g; x,y) {hcd(y)} 8 integral V~ ------ V~ ------ + -i d4xd4y - g(x) -g(y) [h (x)]N abcd[g;x, y)[h (y)] + O(h3), (23) 8 ab cd