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WADGE HIERARCHY OF DIFFERENCES OF CO-ANALYTIC SETS
Published online by Cambridge University Press: 09 March 2016
Abstract
We begin the fine analysis of nonBorel pointclasses. Working in ZFC + DET$\left( {_1^1 } \right)$, we describe the Wadge hierarchy of the class of increasing differences of co-analytic subsets of the Baire space by extending results obtained by Louveau ([5]) for the Borel sets.
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- Copyright © The Association for Symbolic Logic 2016
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