A Compressed Breadth-First Search for Satisfiability
ALENEX '02 Revised Papers from the 4th International Workshop on Algorithm Engineering and Experiments
Random 3-SAT: The Plot Thickens
CP '02 Proceedings of the 6th International Conference on Principles and Practice of Constraint Programming
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There are many different ways of proving formulas in proposition logic. Many of these can easily be characterized as forms of resolution. Others use so-called binary decision diagrams (BDDs). Experimental evidence suggests that BDDs and resolution based techniques are fundamentally different, in the sense that their performance can differ very much on benchmarks. In this paper we confirm these findings by mathematical proof. We provide examples that are easy for BDDS and exponentially hard for any form of resolution, and vice versa, examples that ar easy for resolution and exponentially hard for BDDs.