Equation Icon  [ℒ ,ℒ ] = (m − n)ℒ + cLm (m2 − A )δ , m n m+n 12 L m+n,0 [ℒ , ¯ℒ ] = 0, (86 ) [ m n ] c ¯ℒm, ¯ℒn = (m − n)ℒ¯m+n + -Rm (m2 − AR )δm+n,0, 12