Equation Icon  ( ) ( f ′ ) | a¯ | | 2(¯p +1 p¯¯)¯′ | | b | | − a + 2(l − l )| (scalar) || ¯l || || 2¯b + ¯p || Q (ik) || ¯p || = i|k ||| 2a + ¯l′ || . (4.37 ) ( ¯l′) ( ¯p′ ) ′ ¯′ ¯p l