Equation Icon  | 4 δ2S [g + h ±]| ∘--------∘----------+IF----+---|| = − HabScd[g;x,y ) − Kabcd [g;x, y) + iN abcd[g;x,y ), − g (x ) − g(y)δh ab(x)δh cd(y)|h±=h | (27 ) --------4-----------δ2SIF[g-±]--|| abcd abcd ∘ ------∘ ------δh+ (x)δh −(y)|| = − H A [g;x,y ) − iN [g;x,y), − g (x ) − g(y) ab cd h±=h