Equation Icon  ( ) c01 c02 c03 c04 1 1 1 1 c 1 c2 c 3 c4 1 ij A B k l A'B' 1 a b g d n := det 1 2 3 4 = 4e klci c j pA'pB'eABe = 4eabgdZ1 Z2Z 3Z 4, (49) p0'p 0'p0'p 0' p11'p21'p31'p41'