Фото: Evelyn Hockstein / Reuters
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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"They need to get to a resolution," according to Emelia Probasco, Senior Fellow at Georgetown University's Center for Security and Emerging Technology.，详情可参考同城约会
While insects are a novel food in some countries, tainted spices are a persistent global problem. For instance, fraudsters add widely available industrial dyes to paprika.