When following the electric-charge-sign convention, the lepton number (shown with an over-bar here, to reduce confusion) of an electron, muon, tauon, and any neutrino counts as L ¯ ¯ = − − 1 ; the lepton number of the positron, antimuon, antitauon, and any antineutrino counts as L ¯ ¯ = + 1. When this reversed-sign convention is observed, the baryon number is left unchanged, but the difference B − L is replaced with a sum: B + L , whose number value remains unchanged, since