Equation Icon  ( n×n) Jn = 0 Id , (6.114 ) − Idn×n 0 ( Idp×p 0 0 0 ) | q×q | Kp,q = | 0 − Id 0p×p 0 | , (6.115 ) ( 0 0 Id 0 ) 0 0 0 − Idq×q ( p×p ) 0 0 Id 0q×q L = K J = || 0 0 0 − Id || , (6.116 ) p,q p,q p+q ( − Idp×p 0 0 0 ) 0 Idq×q 0 0