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Noun
1. propositional logicSee also 述語論理
Wikipedia definition
2. Propositional calculusIn mathematical logic, a propositional calculus or logic (also called sentential calculus or sentential logic) is a formal system in which formulas of a formal language may be interpreted as representing propositions. A system of inference rules and axioms allows certain formulas to be derived, called theorems; which may be interpreted as true propositions.
Read “Propositional calculus” on English Wikipedia
Read “命題論理” on Japanese Wikipedia
Read “Propositional calculus” on DBpedia

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