De Morgans lover (logikk).
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¬(p∨q)≡¬p∧¬q\neg(p\lor q)\equiv\neg p\land\neg q¬(p∨q)≡¬p∧¬q. ¬(p∧q)≡¬p∨¬q\neg(p\land q)\equiv\neg p\lor\neg q¬(p∧q)≡¬p∨¬q.
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