This essay is a chapter of a treatise to which the author is working since many years. Formulas oftes can present to reader some difficoulties because presuppose definition before given. In "Methodologia 3" the author had expressed some of his foundamental ideas. Now he changes the symbols of the elementary cathegories, subsituting initial letters of words to numbers. Moreover, different interpretations are given for the meaning of "equal", "different", "mean", and "mode".

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