Waste management
There is a special form for boolean formulas called "Conjunctive Normal Form" (CNF). A problem in this form consists of clauses connected with and operators, where each clause only contains variables connected with or operators. The variables can appear negated, but only variables can be directly negated, something like !(a && b) is not allowed. An example boolean formula in CNF form is:
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Matthew Rhys says Michael Sheen puts Welsh actors to shame
Nature, Published online: 26 February 2026; doi:10.1038/d41586-026-00672-z，更多细节参见同城约会
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