English: Crossover gadget as shown in D. Lichtenstein's Planar Formulae and Their Uses (1982) used to prove the NP-completeness of Planar SAT. The left side shows a crossing and the right side shows the crossover gadget. Small dots denote clauses, black and red edges denote non-inverted and inverted edges respectively.
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{{Information |description={{en|1=Crossover gadget as shown in D. Lichtenstein's ''Planar Formulae and Their Uses'' (1982) used to prove the NP-completeness of Planar SAT. The left side shows a crossing and the right side shows the crossover gadget. Small dots denote clauses, black and red edges denote non-inverted and inverted edges respectively.}} |date=2022-04-02 |source={{own}} |author=LightbulbMEOW }} Category:Computer science [[Category:Boolean satisfiability...