"propositional calculus"@en . "propositional logic"@en . "propositional calculus"@en . . . . . . . . . . "branch of logic concerned with the study of propositions (whether they are true or false) that are formed by other propositions with the use of logical connectives, and how their value depends on the truth value of their components"@en . "propositional calculus"@en . . .