PPSZ for General k-SAT - Making Hertli's Analysis Simpler and 3-SAT Faster

The currently fastest known algorithm for k-SAT is PPSZ named after its inventors Paturi, Pudlák, Saks, and Zane [7]. Analyzing its running time is much easier for input formulas with a unique satisfying assignment. In this paper, we achieve three goals. First, we simplify Hertli’s 2011 analysis [1] for input formulas with multiple satisfying assignments. Second, we show a “translation result”: if you improve PPSZ for k-CNF formulas with a unique satisfying assignment, you will immediately get a (weaker) improvement for general k-CNF formulas. Combining this with a result by Hertli from 2014 [2], in which he gives an algorithm for Unique-3-SAT slightly beating PPSZ, we obtain an algorithm beating PPSZ for general 3-SAT, thus obtaining the so far best known worst-case bounds for 3-SAT. 1998 ACM Subject Classification F.2.2 Nonnumerical Algorithms and Problems