Examples and Counterexamples
All of the following formulas are in CNF:
The last formula is in CNF because it can be seen as the conjunction of the two single-literal clauses and . Incidentally, this formula is also in disjunctive normal form. The following formulas are not in CNF:
The above three formulas are respectively equivalent to the following three formulas that are in CNF:
Read more about this topic: Conjunctive Normal Form
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“No rules exist, and examples are simply life-savers answering the appeals of rules making vain attempts to exist.”
—André Breton (1896–1966)
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