- Lepton number is always conserved
- Electron number, muon number and tau number are also always conserved
- Take an example: A muon decays into a muon-neutrino and an electron and an antielectron-neutrino
m num: (+1) -> (+1) + (0) + (0) <- Conserved
e num: (0) -> (0) + (+1) + (-1) <- Conserved
l num: (+1) -> (+1) + (+1) + (-1) <- Conserved
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