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Field of study Full text link We show that it is decidable whether a given a regular tree language belongs
to the class Δ 2 0 {\bf \Delta^0_2} Δ 2 0 ​ of the Borel hierarchy, or equivalently whether
the Wadge degree of a regular tree language is countable.Comment: 15 pages, 2 figure
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Publication date 01/01/2005
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