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Boolean algebra, and other forms of abstract propositional logic, are based on dealing with compound propositions made up of simple propositions joined by logical connectors like "and", "or", and ...
Kazimierz Ajdukiewicz, Proposition as the Connotation of Sentence, Studia Logica: An International Journal for Symbolic Logic, T. 20 (1967), pp. 87-98 ...