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Towards Completeness via Proof Search in the Linear Time μ-calculus: The case of Büchi inclusions

Published: 05 July 2016 Publication History

Abstract

Modal μ-calculus is one of the central languages of logic and verification, whose study involves notoriously complex objects: automata over infinite structures on the model-theoretical side; infinite proofs and proofs by (co)induction on the proof-theoretical side. Nevertheless, axiomatizations have been given for both linear and branching time μ-calculi, with quite involved completeness arguments. We come back to this central problem, considering it from a proof search viewpoint, and provide some new completeness arguments in the linear time μ-calculus. Our results only deal with restricted classes of formulas that closely correspond to (non-alternating) ω-automata but, compared to earlier proofs, our completeness arguments are direct and constructive. We first consider a natural circular proof system based on sequent calculus, and show that it is complete for inclusions of parity automata expressed as formulas, making use of Safra's construction directly in proof search. We then consider the corresponding finitary proof system, featuring (co)induction rules, and provide a partial translation result from circular to finitary proofs. This yields completeness of the finitary proof system for inclusions of sufficiently deterministic parity automata, and finally for arbitrary Büchi automata.

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  • (2022)Bouncing Threads for Circular and Non-Wellfounded ProofsProceedings of the 37th Annual ACM/IEEE Symposium on Logic in Computer Science10.1145/3531130.3533375(1-13)Online publication date: 2-Aug-2022
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  1. Towards Completeness via Proof Search in the Linear Time μ-calculus: The case of Büchi inclusions

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        cover image ACM Conferences
        LICS '16: Proceedings of the 31st Annual ACM/IEEE Symposium on Logic in Computer Science
        July 2016
        901 pages
        ISBN:9781450343916
        DOI:10.1145/2933575
        Permission to make digital or hard copies of all or part of this work for personal or classroom use is granted without fee provided that copies are not made or distributed for profit or commercial advantage and that copies bear this notice and the full citation on the first page. Copyrights for components of this work owned by others than the author(s) must be honored. Abstracting with credit is permitted. To copy otherwise, or republish, to post on servers or to redistribute to lists, requires prior specific permission and/or a fee. Request permissions from [email protected].

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        Publication History

        Published: 05 July 2016

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        Author Tags

        1. (co)induction
        2. circular proofs
        3. mu-calculus
        4. parity automata
        5. proof-search
        6. safra construction
        7. sequent calculus

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        View all
        • (2022)Bouncing Threads for Circular and Non-Wellfounded ProofsProceedings of the 37th Annual ACM/IEEE Symposium on Logic in Computer Science10.1145/3531130.3533375(1-13)Online publication date: 2-Aug-2022
        • (2021)Non-well-founded Deduction for Induction and CoinductionAutomated Deduction – CADE 2810.1007/978-3-030-79876-5_1(3-24)Online publication date: 5-Jul-2021
        • (2019)Infinets: The Parallel Syntax for Non-wellfounded Proof-TheoryAutomated Reasoning with Analytic Tableaux and Related Methods10.1007/978-3-030-29026-9_17(297-316)Online publication date: 14-Aug-2019
        • (2017)Constructive completeness for the linear-time μ-calculusProceedings of the 32nd Annual ACM/IEEE Symposium on Logic in Computer Science10.5555/3329995.3330010(1-12)Online publication date: 20-Jun-2017
        • (2017)Constructive completeness for the linear-time μ-calculus2017 32nd Annual ACM/IEEE Symposium on Logic in Computer Science (LICS)10.1109/LICS.2017.8005075(1-12)Online publication date: Jun-2017
        • (2017)A Cut-Free Cyclic Proof System for Kleene AlgebraAutomated Reasoning with Analytic Tableaux and Related Methods10.1007/978-3-319-66902-1_16(261-277)Online publication date: 30-Aug-2017
        • (2016)Towards Completeness via Proof Search in the Linear Time μ-calculusProceedings of the 31st Annual ACM/IEEE Symposium on Logic in Computer Science10.1145/2933575.2933598(377-386)Online publication date: 5-Jul-2016

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