 By a traditional account of coherence we will mean one which construes coherence as a relation of mutual support or agreement among given data (propositions, beliefs, memories, testimonies etc.). Early characterizations were given by, among others, Brand Blanshard (1939) and A. C. Ewing (1934). According to Ewing, a coherent set is characterized partly by consistency and partly by the property that every belief in the set follows logically from the others taken together. Thus, a set such as \(\{A_1, A_2, A_1 \amp A_2\}\), if consistent, is highly coherent on this view because each element follows by logical deduction from the rest in concert.