DOI: 10.1177/22113568261468521 ISSN: 2211-3568

Degree structures of hyperspaces over unusual ground types

Takayuki Kihara, Keng Meng Ng
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In this article, we investigate the degree structures of various hyperspaces. One of our goals is to gain a topological understanding of higher-type computability using negative information, and to this end, we mainly explore the degree structures of hyperspaces whose ground types are endowed with cofinite topology or its relatives.

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