An Effective Classification of Borel Wadge Classes
arxiv(2022)
摘要
We give a new and effective classification of all Borel Wadge classes of subsets of Baire space. This relies on the true stage machinery originally developed by Montalb\'an. We use this machinery to give a new proof of Louveau and Saint-Raymond's separation theorem for Borel Wadge classes. This gives a proof of Borel Wadge determinacy in the subsystem $\text{ATR}_0+\Pi^1_1$-I of second-order arithmetic.
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关键词
borel wadge classes,effective classification
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