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Fixpoint alternation: arithmetic,transition systems, and the binary tree

Published online by Cambridge University Press:  15 August 2002

J. C. Bradfield*
Affiliation:
LFCS, Division of Informatics, University of Edinburgh, Edinburgh EH9 3JZ, U.K., jcb@lfcs.ed.ac.uk. BRICS, Department of Computer Science, Aarhus University, Bygning 540, Ny Munkegade, 8000 Århus C, Denmark.
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Abstract

We provide an elementary proof of the fixpoint alternation hierarchyin arithmetic, which in turn allows us to simplify the proof of themodal mu-calculus alternation hierarchy. We further show that thealternation hierarchy on the binary tree is strict, resolving aproblem of Niwiński.

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Type
Research Article
Copyright
© EDP Sciences, 1999

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