Titlebook: Computer Science Logic; 20th International W Zoltán ésik Conference proceedings 2006 Springer-Verlag Berlin Heidelberg 2006 AI logics.Actio

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Computer Science Logic978-3-540-45459-5Series ISSN 0302-9743 Series E-ISSN 1611-3349

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0302-9743 Overview: 978-3-540-45458-8978-3-540-45459-5Series ISSN 0302-9743 Series E-ISSN 1611-3349

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excrete

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Kenneth C. Mills,Carl-?ke D?ckerIn this article, we study the quantified constraint satisfaction problem (QCSP) over infinite domains. We develop a technique called collapsibility that allows one to give strong complexity upper bounds on the QCSP. This technique makes use of both logical and universal-algebraic ideas. We give applications illustrating the use of our technique.

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A Finite Semantics of Simply-Typed Lambda Terms for Infinite Runs of Automataa-trees it is decidable whether a given automaton has a run or not. As regular lambda-trees are precisely recursion schemes, this decidability result holds for arbitrary recursion schemes of arbitrary level, without any syntactical restriction. This partially solves an open problem of Knapik, Niwinski and Urzyczyn.