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indicator function

function that returns 1 if an element is present in a specified subset and 0 if absent; naturally isomorphic with a set's subsets
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indicator function

Summary

indicator function ranks in the top 2% of general entities by monthly Wikipedia readership (292 views/month).[1]

Key Facts

  • indicator function's subclass of is recorded as function[2].
  • indicator function's Freebase ID is recorded as /m/01jyfs[3].
  • indicator function's Gran Enciclopèdia Catalana ID is recorded as 0153348[4].
  • indicator function's defining formula is recorded as \mathbf{1}_A(x) := \begin{cases} 1 ~&\text{ if }~ x \in A~, \ 0 ~&\text{ if }~ x \notin A~. \end{cases}[5].
  • indicator function's studied by is recorded as theory of indicator functions[6].
  • indicator function's Treccani ID is recorded as indicatrice[7].
  • indicator function's maintained by WikiProject is recorded as WikiProject Mathematics[8].
  • indicator function's Microsoft Academic ID is recorded as 53099996[9].
  • indicator function's in defining formula is recorded as \mathbf{1}_A[10].
  • indicator function's in defining formula is recorded as A[11].
  • indicator function's Treccani's Enciclopedia della Matematica ID is recorded as funzione-indicatrice[12].
  • indicator function's Treccani's Enciclopedia della Matematica ID is recorded as funzione-caratteristica[13].
  • indicator function's Gran Enciclopèdia Catalana ID is recorded as funcio-indicatriu-duna-part-dun-conjunt[14].

Why It Matters

indicator function ranks in the top 2% of general entities by monthly Wikipedia readership (292 views/month).[1] It has Wikipedia articles in 24 language editions, a strong signal of global cultural recognition.[15] It is known by 7 alternative names across languages and contexts.[16]

References

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

Direct Wikidata claims

  1. [2] ↑ . wikidata.org.
  2. [3] ↑ . Freebase Data Dumps. wikidata.org.
  3. [4] ↑ . wikidata.org.
  4. [5] ↑ . wikidata.org.
  5. [6] ↑ . wikidata.org.
  6. [7] ↑ . wikidata.org.
  7. [8] ↑ . wikidata.org.
  8. [9] ↑ . wikidata.org.
  9. [10] ↑ . wikidata.org.
  10. [11] ↑ . wikidata.org.
  11. [12] ↑ . wikidata.org.
  12. [13] ↑ . wikidata.org.
  13. [14] ↑ . wikidata.org.

Aggregate / graph-position facts

  1. [1] ↑ . Wikimedia Foundation. dumps.wikimedia.org.
  2. [15] ↑ . Wikidata sitelinks. wikidata.org.
  3. [16] ↑ . Wikidata aliases. wikidata.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). indicator function. Retrieved April 10, 2026, from https://4ort.xyz/entity/indicator-function
MLA “indicator function.” 4ort.xyz Knowledge Graph, 4ort.xyz, 10 Apr. 2026, https://4ort.xyz/entity/indicator-function.
BibTeX @misc{4ortxyz_indicator-function_2026, author = {{4ort.xyz Knowledge Graph}}, title = {{indicator function}}, year = {2026}, url = {https://4ort.xyz/entity/indicator-function}, note = {Accessed: 2026-04-10}}
LLM prompt According to 4ort.xyz Knowledge Graph (aggregator of Wikidata, Wikipedia, and authoritative open-data sources): indicator function — https://4ort.xyz/entity/indicator-function (retrieved 2026-04-10)

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