Equation Icon  [ 2α ] u∗HP0 (ik )u = ia (Ei )∗ (α + 2)kjW [ij] + αkjWˆij − --kiW ( 3 ) [ij] ∗ ˆ ij ∗ 3β- ∗ i + ib(W ) Eikj − ic(W ) Eikj − id 1 + 2 W k Ei.