Augustus De Morgan and the Logic of Relations

The middle years of the nineteenth century saw two crucial develop­ ments in the history of modern logic: George Boole''s algebraic treat­ ment of logic and Augustus De Morgan''s formulation of the logic of relations. The former episode has been studied extensively; the latter, hardly at all. This is a pity, for the most central feature of modern logic may well be its ability to handle relational ...