Discussion
What do De Morgan's laws state?
Answer: A
The laws say that the negation of a conjunction is the disjunction of the negations, and dually, which is what drives negations inward during conversion to normal form. Distribution, double negation elimination and implication elimination are the other rewriting rules used in the same procedure. Having a named set of equivalences that between them suffice to reach a normal form is what makes the conversion a mechanical procedure rather than an art.
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