A recursive approach to solving parity games in quasipolynomial time

K Lehtinen, P Parys, S Schewe… - Logical Methods in …, 2022 - lmcs.episciences.org
Zielonka's classic recursive algorithm for solving parity games is perhaps the simplest
among the many existing parity game algorithms. However, its complexity is exponential …

Parity games: Zielonka's algorithm in quasi-polynomial time

P Parys - arXiv preprint arXiv:1904.12446, 2019 - arxiv.org
Calude, Jain, Khoussainov, Li, and Stephan (2017) proposed a quasi-polynomial-time
algorithm solving parity games. After this breakthrough result, a few other quasi-polynomial …

Good for games automata: From nondeterminism to alternation

U Boker, K Lehtinen - arXiv preprint arXiv:1906.11624, 2019 - arxiv.org
A word automaton recognizing a language $ L $ is good for games (GFG) if its composition
with any game with winning condition $ L $ preserves the game's winner. While all …

Universal graphs and good for games automata: New tools for infinite duration games

T Colcombet, N Fijalkow - … Conference, FOSSACS 2019, Held as Part of …, 2019 - Springer
In this paper, we give a self contained presentation of a recent breakthrough in the theory of
infinite duration games: the existence of a quasipolynomial time algorithm for solving parity …

Smaller progress measures and separating automata for parity games

D Dell'Erba, S Schewe - Frontiers in Computer Science, 2022 - frontiersin.org
Calude et al. have recently shown that parity games can be solved in quasi-polynomial time,
a landmark result that has led to several approaches with quasi-polynomial complexity …

Rabin games and colourful universal trees

R Majumdar, I Sağlam, KS Thejaswini - … on Tools and Algorithms for the …, 2024 - Springer
We provide an algorithm to solve Rabin and Streett games over graphs with n vertices, m
edges, and k colours that runs in O~ mn (k!) 1+ o (1) time and O (nk log k log n) space …

[PDF][PDF] The theory of universal graphs for infinite duration games

T Colcombet, N Fijalkow… - Logical Methods in …, 2022 - lmcs.episciences.org
We introduce the notion of universal graphs as a tool for constructing algorithms solving
games of infinite duration such as parity games and mean payoff games. In the first part we …

A compositional approach to parity games

K Watanabe, C Eberhart, K Asada, I Hasuo - arXiv preprint arXiv …, 2021 - arxiv.org
In this paper, we introduce open parity games, which is a compositional approach to parity
games. This is achieved by adding open ends to the usual notion of parity games. We …

The Strahler number of a parity game

L Daviaud, M Jurdziński, KS Thejaswini - arXiv preprint arXiv:2003.08627, 2020 - arxiv.org
The Strahler number of a rooted tree is the largest height of a perfect binary tree that is its
minor. The Strahler number of a parity game is proposed to be defined as the smallest …

[PDF][PDF] A quasi-polynomial black-box algorithm for fixed point evaluation

A Arnold, D Niwiński, P Parys - 29th EACSL Annual Conference …, 2021 - drops.dagstuhl.de
We consider nested fixed-point expressions like μ z. ν y. μ x. f (x, y, z) evaluated over a finite
lattice, and ask how many queries to a function f are needed to find the value. The previous …