On global induction mechanisms in a μ-calculus with explicit approximations
RAIRO - Theoretical Informatics and Applications - Informatique Théorique et Applications, Tome 37 (2003) no. 4, pp. 365-391.

We investigate a Gentzen-style proof system for the first-order μ-calculus based on cyclic proofs, produced by unfolding fixed point formulas and detecting repeated proof goals. Our system uses explicit ordinal variables and approximations to support a simple semantic induction discharge condition which ensures the well-foundedness of inductive reasoning. As the main result of this paper we propose a new syntactic discharge condition based on traces and establish its equivalence with the semantic condition. We give an automata-theoretic reformulation of this condition which is more suitable for practical proofs. For a detailed comparison with previous work we consider two simpler syntactic conditions and show that they are more restrictive than our new condition.

DOI : 10.1051/ita:2003024
Classification : 68Q60, 03F07, 03B35
Mots-clés : inductive reasoning, circular proofs, well-foundedness, global consistency condition, μ-calculus, approximants 
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     title = {On global induction mechanisms in a $\mu $-calculus with explicit approximations},
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Sprenger, Christoph; Dam, Mads. On global induction mechanisms in a $\mu $-calculus with explicit approximations. RAIRO - Theoretical Informatics and Applications - Informatique Théorique et Applications, Tome 37 (2003) no. 4, pp. 365-391. doi : 10.1051/ita:2003024. https://numdam.org/articles/10.1051/ita:2003024/

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