no. 1
Wadge degrees of ω-languages of deterministic Turing machines
RAIRO - Theoretical Informatics and Applications - Informatique Théorique et Applications, Tome 37 (2003) no. 1, pp. 67-83.

We describe Wadge degrees of ω-languages recognizable by deterministic Turing machines. In particular, it is shown that the ordinal corresponding to these degrees is ξ ω where ξ=ω 1 CK is the first non-recursive ordinal known as the Church-Kleene ordinal. This answers a question raised in [2].

DOI : 10.1051/ita:2003008
Classification : 03D55, 04A15, 68Q05
Mots clés : hierarchy, Wadge degree, $\omega $-language, ordinal, Turing machine, set-theoretic operation 
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Selivanov, Victor. Wadge degrees of $\sf \omega $-languages of deterministic Turing machines. RAIRO - Theoretical Informatics and Applications - Informatique Théorique et Applications, Tome 37 (2003) no. 1, pp. 67-83. doi : 10.1051/ita:2003008. http://www.numdam.org/articles/10.1051/ita:2003008/

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