Equation Icon  α ∨= K1 − K2 − K3 , 2 1 1∨ 21 21 3 e2 = K 31, f2 = K 22, α 2∨ = K 32 − K 12, (8.33 ) e3 = K 2, f3 = K 3, α 3 = K 3 − K 2.