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The Theory of Deduction for Propositions containing Apparent Variables

, 1997
Alfred North Whitehead, Bertrand Russell
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A Formalisation of Post's m‐Valued Propositional Calculus with Variable Functors

Mathematical Logic Quarterly, 1965
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Review: Jan Lukasiewicz, On Variable Functors of Propositional Arguments; C. A. Meredith, On an Extended System of the Propositional Calculus

, 1951
Alonzo Church
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Dissociative Memory, Variables that Influence Reconstruction, and Propositional Coding

2014
Mary Howes, Geoffrey O'Shea
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An algebraic model of the m-valued propositional calculus with variable functors

, 1968
Alan Rose
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Review: M. A. E. Dummett, E. J. Lemmon, Modal Logics Between S4 and S5; Iwao Nishimura, On Formulas of One Variable in Intuitionistic Propositional Calculus; D. C. Makinson, There are Infinitely Many Diodorean Modal Functions

, 1967
A. N. Prior
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Propositional Variable

2010
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