The Commens Dictionary
Quote from ‘Book II. Division I. Part 2. Logic of Relatives. Chapter XII. The Algebra of Relatives’
As all of logic deals with relations, it is more accurate to describe the branch of logic with which I am going to expound as the logic of relatives, i.e. relative terms. Relations as relatives are either dual, as in “A loves B” or plural, as “A gives B to C”.