The phase transition in random Horn satisfiability and its algorithmic implications

Let c>0 be a constant, and $\Phi$ be a random Horn formula with n variables and $m=c\cdot 2^{n}$ clauses, chosen uniformly at random (with repetition) from the set of all nonempty Horn clauses in the given variables. By analyzing \PUR, a natural implementation of positive unit resolution, we show that \lim_{n\goesto \infty} \PR ({\Phi is satisfiable})= 1-F(e^{-c}), where $F(x)=(1-x)(1-x^2)(1-x^4)(1-x^8)...$. Our method also yields as a byproduct an average-case analysis of this algorithm.