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The most general Clebsch‐Gordan coefficients to reduce the physically most important n‐fold product representations of the groups P+↑ and P (Universal covering groups of the restricted and full inhomogemeous Lorentz groups) are derived. They are used to answer the question: What can be said about the S‐matrix if only Lorentz invariance is postulated

The Most General Clebsch-Gordan Coefficients of the Universal Covering Group of the Inhomogeneous Lorentz Group