We derive the electron mass from BCT lattice geometry via a two-loop D4 instanton calculation. The result mₑ = 0. 510927 MeV agrees with the PDG value to −0. 014% (Prediction #93), using zero free parameters beyond the Planck mass anchor. This is the first sub-1% BCT prediction for the electron mass.
Michel Robert Cabrié (Sun,) studied this question.