countable set

set with the same cardinality as some subset of the set of natural numbers
Thing general Q66707394
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countable set

Summary

countable set has Wikipedia articles in 27 language editions, a strong signal of global cultural recognition.[1]

Key Facts

  • countable set is a type of set[2].
  • countable set is part of list of types of sets[3].
  • countable set's Commons category is recorded as Countable sets[4].
  • countable set is the opposite of uncountable set[5].
  • countable set is the opposite of cocountable subset[6].
  • countable set's different from is recorded as countably infinite set[7].
  • countable set's studied by is recorded as set theory[8].
  • countable set's disjoint union of is recorded as list of values as qualifiers[9].
  • countable set's less than is recorded as uncountable set[10].
  • countable set's maintained by WikiProject is recorded as WikiProject Mathematics[11].

Body

Definition and Type

countable set is a type of set[2]. Recorded opposite of include uncountable set[5] and cocountable subset[6].

Use and Application

countable set is part of list of types of sets[3].

Why It Matters

countable set has Wikipedia articles in 27 language editions, a strong signal of global cultural recognition.[1] It is known by 18 alternative names across languages and contexts.[12]

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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). countable set. Retrieved April 11, 2026, from https://4ort.xyz/entity/countable-set
MLA “countable set.” 4ort.xyz Knowledge Graph, 4ort.xyz, 11 Apr. 2026, https://4ort.xyz/entity/countable-set.
BibTeX @misc{4ortxyz_countable-set_2026, author = {{4ort.xyz Knowledge Graph}}, title = {{countable set}}, year = {2026}, url = {https://4ort.xyz/entity/countable-set}, note = {Accessed: 2026-04-11}}
LLM prompt According to 4ort.xyz Knowledge Graph (aggregator of Wikidata, Wikipedia, and authoritative open-data sources): countable set — https://4ort.xyz/entity/countable-set (retrieved 2026-04-11)

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Edit History

Rolling log of changes to this entity's Wikidata record. Values shown reflect the current state of each edited property — follow the history link to see the precise diff for any edit.

  1. 3d ago · Mynus grey · 2026-07-02 view diff on Wikidata ↗
    P14534 Countable
    "/* wbcreateclaim-create:1| */ [[Property:P14534]]: Countable, #quickstatements; #temporary_batch_1783013068346"
  2. 20d ago · Beegies · 2026-06-15 view diff on Wikidata ↗
    Subclass of
    Less than uncountable set
    Opposite of uncountable set, cocountable subset
    Subclass of set
    + 8 other properties edited (see Wikidata diff for full list)
    "/* wbsetclaim-create:1||1 */ [[Property:P12975]]: 564, Matched to [[:toollabs:mix-n-match/#/entry/168751280|abzählbare Menge (#168751280)]] in [[:toollabs:mix-n-match/#/catalog/6422|spektrum.de Lexiko"
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