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Negative normal form is way to represent the formula by keeping the negation symbol only to the literals. If α and φ are boolean formulas, then αφ , αφ, α, αφ are all boolean formulas. The boolean formulas are made up of literals which are propositional atoms. A formula can be converted to the NNF by simply moving the negations across braces either using De Morgan's laws or the property that α is α itself. External links Math logic tutor