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Effective Wadge hierarchy in computable quasi-Polish spaces

Authors :
Victor L. Selivanov
Source :
Sibirskie Elektronnye Matematicheskie Izvestiya. 18:121-135
Publication Year :
2021
Publisher :
Sobolev Institute of Mathematics, 2021.

Abstract

We define and study an effective version of the Wadge hierarchy in computable quasi-Polish spaces which include most spaces of interest for computable analysis. Along with hierarchies of sets we study hierarchies of k-partitions which are interesting on their own. We show that levels of such hierarchies are preserved by the computable effectively open surjections, that if the effective Hausdorff-Kuratowski theorem holds in the Baire space then it holds in every computable quasi-Polish space, and we extend the effective Hausdorff theorem to k-partitions.

Details

ISSN :
18133304
Volume :
18
Database :
OpenAIRE
Journal :
Sibirskie Elektronnye Matematicheskie Izvestiya
Accession number :
edsair.doi...........eae37f7ddb54c6531daa4e6a026b542f
Full Text :
https://doi.org/10.33048/semi.2021.18.010