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CORDIS

Reasoning using tangles on parity games

Projektbeschreibung

Tangles für Paritätsspiele

Ein Hauptziel der Informatik besteht darin, das formal korrekte Funktionieren der Datenverarbeitung abzusichern. Zu diesem Zweck werden Wege entwickelt, auf denen nachweisbar ist, dass ein Computersystem bestimmte vorgegebene Eigenschaften korrekt implementiert. In diesem Kontext stellen Paritätsspiele eine Herausforderung dar. Sie sind außerdem ein für die theoretische Informatik unwiderstehliches Thema, da davon auszugehen ist, dass sie der Komplexitätsklasse P angehören; und hier warten seit nunmehr zwei Jahrzehnten Fragen auf ihre Beantwortung. Das EU-finanzierte Projekt PIGGY konzentriert sich auf das Verständnis der inhärenten Komplexität der algorithmischen Lösung von Paritätsspielen. Herzstück der Untersuchung ist die Erforschung der Struktur von Tangles.

Ziel

Virtually all aspects of society, industry and science are significantly impacted by increasingly complex computers and the software that they run. A major objective within computer science is to ensure that these computer systems are formally correct by developing ways to prove that a system correctly implements certain given properties, or ways to construct such a system. In this domain of computer science, an important topic is parity games. Many real-world systems run continuously and properties for such systems are described in temporal logics such as linear temporal logic (LTL) and various logics derived from or related to LTL. Solving parity games computes whether a given system has a property specified in these temporal logics, or constructs a system that implements such a property.

Parity games are in addition a compelling subject for theoretical computer science because they are believed to be in the complexity class P; however, this has been an open question for over 20 years. In recent years, new algorithms have been discovered that solve parity games in quasi-polynomial time, while at the same time researchers have found quasi-polynomial lower bounds for several families of algorithms.In my publication on tangle learning, I propose the notion of a tangle and show that existing parity game solving algorithm implicitly explore tangles when reasoning about how a player can force the opponent to move through the parity game from A to B.

The aim of this proposal is to understand the inherent complexity of solving parity games algorithmically. The strategy to achieve this is to obtain fundamental insights into the structure of tangles, how they are handled by parity game solving algorithms and how they arise in practical games.

Koordinator

UNIVERSITEIT TWENTE
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Region
Oost-Nederland Overijssel Twente
Aktivitätstyp
Higher or Secondary Education Establishments
Links
Gesamtkosten
€ 175 572,48