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Case Study of the Proof of Cook's theorem - Interpretation of A(w)

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arxiv 1904.13191 v1 pith:34FUKSAW submitted 2019-04-30 cs.CC

Case Study of the Proof of Cook's theorem - Interpretation of A(w)

classification cs.CC
keywords cooktheoremproblemcasepolynomialprooftime-verifiableappearance
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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Cook's theorem is commonly expressed such as any polynomial time-verifiable problem can be reduced to the SAT problem. The proof of Cook's theorem consists in constructing a propositional formula A(w) to simulate a computation of TM, and such A(w) is claimed to be CNF to represent a polynomial time-verifiable problem w. In this paper, we investigate A(w) through a very simple example and show that, A(w) has just an appearance of CNF, but not a true logical form. This case study suggests that there exists the begging the question in Cook's theorem.

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