New sets of independent postulates for the algebra of logic, with special reference to Whitehead and Russell’s Principia mathematica
Edward V. Huntington · Transactions of the American Mathematical Society · 1933
H. M. Sheffer, A set of five independent postulates for Boolean algebra, with application to logical constants.These Transactions, vol.14 (1913), pp.481^188.B. A. Bernstein, A complete set of postulates for the logic of classes expressed in terms of the operation "exception," and a proof of the independence of a set of postulates due to Del Re.University of