Fuchs, Alexander and Goel, Amit and Grundy, Jim and Krstić, Sava and Tinelli, Cesare - Ground interpolation for the theory of equality

lmcs:709 - Logical Methods in Computer Science, February 16, 2012, Volume 8, Issue 1
Ground interpolation for the theory of equality

Authors: Fuchs, Alexander and Goel, Amit and Grundy, Jim and Krstić, Sava and Tinelli, Cesare

Theory interpolation has found several successful applications in model checking. We present a novel method for computing interpolants for ground formulas in the theory of equality. The method produces interpolants from colored congruence graphs representing derivations in that theory. These graphs can be produced by conventional congruence closure algorithms in a straightforward manner. By working with graphs, rather than at the level of individual proof steps, we are able to derive interpolants that are pleasingly simple (conjunctions of Horn clauses) and smaller than those generated by other tools. Our interpolation method can be seen as a theory-specific implementation of a cooperative interpolation game between two provers. We present a generic version of the interpolation game, parametrized by the theory T, and define a general method to extract runs of the game from proofs in T and then generate interpolants from these runs.


Source : oai:arXiv.org:1111.5652
DOI : 10.2168/LMCS-8(1:6)2012
Volume: Volume 8, Issue 1
Published on: February 16, 2012
Submitted on: November 21, 2009
Keywords: Computer Science - Logic in Computer Science,D.2.4, F.3.1, F.4.1, I.2.3


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