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Algebra and Combinatorics of Parity Games

Identifieur interne : 003D38 ( Main/Exploration ); précédent : 003D37; suivant : 003D39

Algebra and Combinatorics of Parity Games

Auteurs : Walid Belkhir [France]

Source :

RBID : Hal:tel-01277878

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Abstract

Parity games are the combinatorial description of the theory of binary infimums, and supremums, and of the least and greatest fixed points over complete lattices. Roughly speaking, the parity games formalism may be understood as a μ-calculus over complete lattices. Hierarchies and logical expressiveness are at the core of fixed-point theory. The first part of this the- sis is devoted to consider the variable hierarchy problem within the lattice μ-calculus. Earlier works on this problem within the propositional modal μ- calculus have derived a complexity measure, the so called entanglement. The latter is the combinatorial counterpart of the variable hierarchy. The second part of this thesis is devoted to consider the entanglement as a pure graph theoretic measure, independently of its origins in fixed-point theory. Further results will be proved in this direction, such that the recognization of graphs of bounded entanglement, the tree decomposition of these graphs, and the closure under minors.

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Le document en format XML

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<div type="abstract" xml:lang="en">Parity games are the combinatorial description of the theory of binary infimums, and supremums, and of the least and greatest fixed points over complete lattices. Roughly speaking, the parity games formalism may be understood as a μ-calculus over complete lattices. Hierarchies and logical expressiveness are at the core of fixed-point theory. The first part of this the- sis is devoted to consider the variable hierarchy problem within the lattice μ-calculus. Earlier works on this problem within the propositional modal μ- calculus have derived a complexity measure, the so called entanglement. The latter is the combinatorial counterpart of the variable hierarchy. The second part of this thesis is devoted to consider the entanglement as a pure graph theoretic measure, independently of its origins in fixed-point theory. Further results will be proved in this direction, such that the recognization of graphs of bounded entanglement, the tree decomposition of these graphs, and the closure under minors.</div>
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