Sixth-order electron g factor: Mass-operator approach. II

Continuing our analytic calculation of the sixth-order magnetic moment, we report here the results of vacuum-polarization modifications of the fourth-order ladder diagram. We obtain ${(1/2g{-}1)}ₛᵢₓₜₕ^{{'}}={({{α}}{2{π}})}³[({-}16/3{{π}}²+476/9)ln{λ}+17{ζ}(3)+16{{π}}²ln2{-}100/9{{π}}²{-}574/27]$, of which only part had been previously calculated analytically. Previous numerical computations are in good agreement with this exact result.