Anderson’s logic was a theory of the proposition which he described as Positivism. However Anderson’s theory had very little in common with the philosophy of Logical Positivism. Anderson’s theory emphasised the distinctive roles of the subject, predicate, and copula of the proposition and, when combined with the quantifiers of the proposition, Anderson’s view of the proposition was central to his defence of the syllogism. The central feature of Anderson’s theory was that propositions are true or false independent of the context in which they are proposed. Hence, he rejected any theory of social or cultural relativism with regard to propositions.