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JOURNALS // Sibirskie Èlektronnye Matematicheskie Izvestiya [Siberian Electronic Mathematical Reports] // Archive

Sib. Èlektron. Mat. Izv., 2021 Volume 18, Issue 1, Pages 121–135 (Mi semr1352)

This article is cited in 3 papers

Mathematical logic, algebra and number theory

Effective Wadge hierarchy in computable quasi-Polish spaces

V. L. Selivanov

A.P. Ershov Institute of Informatics Systems, 6, Lavrent'eva ave., Novosibirsk, 630090, Russia

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.

Keywords: computable quasi-Polish space, effective Wadge hierarchy, fine hierarchy, $k$-partition, preservation property, effective Hausdorff theorem.

UDC: 510.5

MSC: 03D15

Received July 27, 2020, published March 1, 2021

Language: English

DOI: 10.33048/semi.2021.18.010



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