Suppose you are trying to solve a Boolean satisfiability problem C[x]. Now convert the problem into probabilistic domain.
For probability vector x
C[x] = p
= p + 0*K*(B - p)
= lim K->infinity p + 1/K*K(B- p)
= B
For friend
in case a satisfiability, B = 1
in case untestable, assume x_n= 0.5, B = 0
For enemy,
in case a satisfiability, B = 0
in case untestable, assume x_n = 0.5, B = 1
since by cook's thesis, even in 1 problem in NP proven to be P , every problem proven P.
If
reverse result is always true of enemy, the number of permutation is at
least as great as 2^N
where N is number of inputs, showing problem is be NP.
complete proof
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