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The Shmushkevich method for deducing consequences of charge independence is explained and discussed. This method, which avoids entirely the use of Clebsch-Gordan coefficients, generates linear equalities and inequalities among cross sections using only a simple counting procedure. A comprehensive list of such relations, applying to most elementary-particle reactions of interest which involve at least one pair of isospin-{} particles, is presented. A discussion of the various uses of these relations is given.
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Pinski et al. (1965) studied this question.
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