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Propositional calculus
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====Natural deduction==== {{Main article|Natural deduction}} [[Natural deduction]] is a syntactic method of proof that emphasizes the derivation of conclusions from premises through the use of intuitive rules reflecting ordinary reasoning.<ref name=":14"/> Each rule reflects a particular logical connective and shows how it can be introduced or eliminated.<ref name=":14" /> See {{section link||Syntactic proof via natural deduction}}.
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