A systematic analysis of isospin sum rules is presented for the distribution functions of strong, electromagnetic and weak inclusive processes. The general expression for these sum rules is given and some new examples are presented. Recently a number of papers [l-3] have appeared in which lsospin sum rules and inequalities for inclusive processes are discussed. We shall present in this paper a systemaltc derivation, with the aid of the graphical technique of Yutsis, Levinson and Vanagas [4]

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... ), of all isospin sum rules (i.e. isospin equalities for distribution functions). Our procedure can be used, moreover, to derive all inequahties of the Lipkin-Peshkin type [ 11, but since these are incomplete and not necessarily of the optimal kind we shall restrict ourselves to the equalities. The general strong interaction process of interaction process of interest is given by Al+A2+Ag+A4+...+An+X.