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.
or informally as:
"not (A and B)" is the same as "(not A) or (not B)"
"not (A or B)" is the same as "(not A) and (not B)"
and also,
Read full article from De Morgan's laws - Wikipedia, the free encyclopedia
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