division of categorial relation according to its specific and essential differences

“In the second line of division, relation is divided into essential types according to the fundaments of relation, to which fundaments must also correspond diverse formal termini. […] The first fundament is that of subjects relative according to unity and number. On unity and number are founded relations of similarity and dissimilarity, agreement and disagreement, etc. The second fundament is that of subjects relative according to action and reception. For example, it is in this way that all effects and causes are relative. The third fundament is in subjects relative by being one a measure and the other measurable, as cognitive powers are measured by the objects which properly specify them.” (John Poinsot, Treatise on Signs, p. 101)

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