Equation Icon  ( a1 ⋅⋅⋅ 0) ( ) | . | a1 ⋅⋅⋅ ⋅⋅⋅ 0 | .. | | .. | C = |( 0 ⋅⋅⋅ al|) or C = ( . ) , (6.176 ) .. .. 0 ⋅⋅⋅ ak ⋅⋅⋅ 0 . ⋅⋅⋅ .