Abstract
The possibility of extending the concept of iso-spin to leptons produced in the lepton reactions — the K-meson decays (Kµ2, Kµ3 and Ke3 decays), pion decays, muon decays, β-decays, and nuclear capture of muon — is investigated. If we assign the iso-spin one half ofor muons and electrons, and zero for the neutrinos produced in the Kµ2 decays, we can find out a suitable selection rule which allows all the well estabilshed lepton reactions and forbids all the unwanted ones. This method is applied to the K-meson decays in which the lepton reactions coexist with the boson-boson decays (τ → 3π, θ → 2π).

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