Ln(α)⁡(x)=(α+1)nn!⁢M⁡(-n,α+1,x)=(-1)nn!⁢U⁡(-n,α+1,x)=(α+1)nn!⁢x-12⁢(α+1)⁢ⅇ12⁢x⁢Mn+12⁢(α+1),12⁢α⁡(x)=(-1)nn!⁢x-12⁢(α+1)⁢ⅇ12⁢x⁢Wn+12⁢(α+1),12⁢α⁡(x).