Equation Icon  [h, [e ,[e ,⋅⋅⋅ ,[e ,e ]⋅⋅⋅]] = (α + α + ⋅⋅⋅α )(h)[e ,[e ,⋅⋅⋅ ,[e ,e ]⋅⋅⋅] (4.15 ) i1 i2 ik−1 ik i1 i2 ik i1 i2 ik−1 ik