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Degree structures of hyperspaces over unusual ground types

Takayuki Kihara, Keng Meng Ng

Computability | Oct 27, 2026

Abstract

Abstract

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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Authors

Researchers on this paper

Takayuki Kihara

first | Nagoya University | ORCID 0000-0002-1611-952X

Keng Meng Ng

last | Nanyang Technological University | ORCID 0000-0002-7113-0596

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Citation

BibTeX

@article{Kihara2026Degree,
  title = {Degree structures of hyperspaces over unusual ground types},
  author = {Takayuki Kihara and Keng Meng Ng},
  journal = {Computability},
  year = {2026},
  doi = {10.1177/22113568261468521},
  url = {https://doi.org/10.1177/22113568261468521}
}

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