 The Reflexive Law (\(A=A\)). In 1864 Jevons listed this as a postulate (1890, p. 11) and then in §24 he referred to \(A = A\) as a “useless Identical proposition”. In his 1869 paper on substitution it became the “Law of Identity”. In the Principles of Science (1874) it was one of the three “Fundamental Laws of Thought”.