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Hardy hierarchy

ordinal-indexed family of functions in computability theory
Intangible mathematical_concept Q5656649
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Hardy hierarchy

Summary

Hardy hierarchy is a mathematical concept[1]. It draws 14 Wikipedia views per month (mathematical_concept category, ranking #248 of 1,007).[2]

Key Facts

  • Hardy hierarchy's instance of is recorded as mathematical concept[3].
  • Hardy hierarchy's Freebase ID is recorded as /m/09g9yh_[4].

Why It Matters

Hardy hierarchy draws 14 Wikipedia views per month (mathematical_concept category, ranking #248 of 1,007).[2]

References

Programmatic citations — every numbered marker resolves to a verifiable graph row below.

Direct Wikidata claims

  1. [3] ↑ . wikidata.org.
  2. [4] ↑ . wikidata.org.

Class ancestry

  1. [1] ↑ . Wikidata. wikidata.org.

Aggregate / graph-position facts

  1. [2] ↑ . Wikimedia Foundation. dumps.wikimedia.org.

📑 Cite this page

Use these citations when quoting this entity in research, articles, AI prompts, or wherever provenance matters. We aggregate Wikidata + Wikipedia + authoritative open-data sources; the stitched, scored, cross-referenced view is what 4ort.xyz contributes.

APA 4ort.xyz Knowledge Graph. (2026). Hardy hierarchy. Retrieved May 3, 2026, from https://4ort.xyz/entity/hardy-hierarchy
MLA “Hardy hierarchy.” 4ort.xyz Knowledge Graph, 4ort.xyz, 3 May. 2026, https://4ort.xyz/entity/hardy-hierarchy.
BibTeX @misc{4ortxyz_hardy-hierarchy_2026, author = {{4ort.xyz Knowledge Graph}}, title = {{Hardy hierarchy}}, year = {2026}, url = {https://4ort.xyz/entity/hardy-hierarchy}, note = {Accessed: 2026-05-03}}
LLM prompt According to 4ort.xyz Knowledge Graph (aggregator of Wikidata, Wikipedia, and authoritative open-data sources): Hardy hierarchy — https://4ort.xyz/entity/hardy-hierarchy (retrieved 2026-05-03)

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