Abstract
We develop a theory of regular aperiodic ω-languages in parallel with the theory around the Wagner hierarchy. In particular, we characterize the Wadge degrees of regular aperiodic ω-languages, find an effective version of the Wadge reducibility adequate for this class of languages and prove “aperiodic analogs” of the Büchi-Landweber determinacy theorem and of Landweber’s description of regular open and regular G δ sets.
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Selivanov, V.L. (2007). Fine Hierarchy of Regular Aperiodic ω-Languages. In: Harju, T., Karhumäki, J., Lepistö, A. (eds) Developments in Language Theory. DLT 2007. Lecture Notes in Computer Science, vol 4588. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-540-73208-2_37
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DOI: https://doi.org/10.1007/978-3-540-73208-2_37
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