Solved: Let CNFH = {hi

Chapter , Problem 10.23

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QUESTION:

Let CNFH = {hi| is a satisable cnf-formula where each clause contains any number of literals, but at most one negated literal}. 7.25 asked you to show that CNFH P. Now give a log-space reduction from CIRCUIT-VALUE to CNFH to conclude that CNFH is P-complete.

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QUESTION:

Let CNFH = {hi| is a satisable cnf-formula where each clause contains any number of literals, but at most one negated literal}. 7.25 asked you to show that CNFH P. Now give a log-space reduction from CIRCUIT-VALUE to CNFH to conclude that CNFH is P-complete.

ANSWER:


The log-space reduction from CIRCUIT-VALUE to CNFH is as follows:

Given a circuit C with n input bits, it is possible to construct, in log-space, a formula Q over these n variables in conjunctive normal form. Then, we can construct a satisfaction formula , F of the form:

F = (x1 ? x2 ? ......? xn) ? Q

We can also apply the technique of negation normal form

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