O(4) Treatment of the Electromagnetic-Weak Synthesis

A gauge theory is outlined in which the existence of the Cabibbo angle $\theta$, leptonic $\mathrm{CP}$-invariance violation, and $\mu -e$ nonuniversality are linked. To $O\left(G\right)\mathrm{}$, the sole source of nonleptonic decays is a neutral current. There is no conflict with present neutrino data. This $\mathrm{CP}$-invariance violation induces only superweak effects in $K$ decays. A strategy for finding $\theta$ is indicated.