Equation Icon  [ ( )2 ] gtt = − 1 + 2aaˆxa + aaˆxa + R0c0dˆxcˆxd + O (s3) , (9.14 ) g = − 2-R ˆxcˆxd + O(s3), (9.15 ) ta 3 0cad 1- c d 3 gab = δab − 3Racbdˆx ˆx + O (s ). (9.16 )