학술논문
A Flexible Proof Format for SAT Solver-Elaborator Communication
Document Type
Working Paper
Source
Logical Methods in Computer Science, Volume 18, Issue 2 (April 18, 2022) lmcs:8509
Subject
Language
Abstract
We introduce FRAT, a new proof format for unsatisfiable SAT problems, and its associated toolchain. Compared to DRAT, the FRAT format allows solvers to include more information in proofs to reduce the computational cost of subsequent elaboration to LRAT. The format is easy to parse forward and backward, and it is extensible to future proof methods. The provision of optional proof steps allows SAT solver developers to balance implementation effort against elaboration time, with little to no overhead on solver time. We benchmark our FRAT toolchain against a comparable DRAT toolchain and confirm >84% median reduction in elaboration time and >94% median decrease in peak memory usage.