# Difference between electron, muon and tau neutrinos [duplicate]

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The three leptons each carry their own "flavor"; tau type, muon type and electron type. This flavor is conserved in lepton decays. For example when a negative muon decays to an electron, the decay produces $$\mu^- \rightarrow e^- + \bar{\nu_e} + \nu_\mu$$. Note that two neutrinos are required in this decay. A $$\nu_\mu$$ conserves muon flavor on both sides of the equation and a $$\bar{\nu_e} + e^-$$ leaves a net zero (-1 + 1 = 0) electron flavor on both sides of the equation. What "exactly" is different about these neutrinos is hard to say though.