𝒲⁡{Hν(1)⁡(z),Hν(2)⁡(z)}=Hν+1(1)⁡(z)⁢Hν(2)⁡(z)-Hν(1)⁡(z)⁢Hν+1(2)⁡(z)=-4⁢ⅈ/(π⁢z).