Hℓ±⁡(η,ρ)=ⅇ±ⅈ⁢θℓ⁡(η,ρ)⁢(∓2⁢ⅈ⁢ρ)ℓ+1±ⅈ⁢η⁢U⁡(ℓ+1±ⅈ⁢η,2⁢ℓ+2,∓2⁢ⅈ⁢ρ),