15-453 Formal Languages, Automata, and Computation
Lecture 33: NP-Completeness

We prove the NP-completeness of SAT and 3SAT. This gives us a means to show that some problems are hard, that is, under the assumption that P is different from NP they will lie outside of P. This is accomplished by a reduction from a problem already known to be NP-complete.

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Frank Pfenning