From Quasi-Dominions to Progress Measures

TL;DR

This paper enhances parity game solving methods by integrating quasi dominions with progress measures, introducing new measures and correctness proofs to accelerate convergence.

Contribution

It presents a novel integration of quasi dominions into progress measure techniques, including new measures and correctness proofs for improved efficiency.

Findings

Accelerated convergence in parity game solutions

Introduction of a new measure for quasi dominions

Refined correctness proofs for the combined approach

Abstract

We revisit the approaches to the solution of parity games based on progress measures and show how the notion of quasi dominions can be integrated with those approaches. The idea is that, while progress measure based techniques typically focus on one of the two players, little information is gathered on the other player during the solution process. Adding quasi dominions provides additional information on this player that can be leveraged to greatly accelerate convergence to a progress measure. To accommodate quasi dominions, however, non trivial refinements of the approach are necessary. In particular, we need to introduce a novel notion of measure and a new method to prove correctness of the resulting solution technique.