Projection Complete Graph Problems Corresponding to a Branching-Program-Based Characterization of the Complexity Classes NC1 ,Land NL
The p-projection completeness of some restricted graph accessibility problems for the (nonuniform) complexity classes NC 1 L and NL will be proved by means of branching-program-based characterizations of these classes. A simulation result concerning polynomial-size, bounded-width disjunctive branching programs and polynomial-size, bounded-width usual ones yields that NC 1=L implies L=NL. Some consequences of these results for separating these classes are discussed.
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