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The rules can be expressed in English as:
The negation of a conjunction is the disjunction of the negations.
The negation of a disjunction is the conjunction of the negations.
The rules can be expressed in formal-languagewith two propositions P and Q as:
where:
- ¬ is the negation operator (NOT)
- is the conjunction operator (AND)
- is the disjunction operator (OR)
- ⇔ is a metalogic-1symbol meaning "can be replaced in a formal-proofwith"
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