Negation Normal Form

Negation Normal Form (NNF) is a way of writing logical statements so that all negations (not) only directly apply to individual variables, not to complex expressions. In NNF, the expression uses only AND, OR, and negation symbols, with negations appearing just before simple statements or variables. This form makes logical expressions easier to analyze and process, especially in computer algorithms, by standardizing the structure of logical formulas. Essentially, NNF simplifies the structure while preserving the original meaning, facilitating tasks like logical reasoning and automated theorem proving.