Kleene plus

unary operation on sets of strings, used in regular expressions for "one or more repetitions"
Thing unary_operation Q87913369
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Kleene plus

Summary

Kleene plus is an unary operation[1]. It draws 4 Wikipedia views per month (unary_operation category, ranking #11 of 9).[2]

Key Facts

  • Kleene plus's instance of is recorded as unary operation[3].
  • Stephen Cole Kleene is named after Kleene plus[4].
  • Kleene plus's notation is recorded as plus sign[5].
  • Kleene plus's notation is recorded as plus sign[6].
  • Kleene plus's described at URL is recorded as https://en.wikipedia.org/wiki/Kleene_star#Kleene_plus[7].
  • Kleene plus's facet of is recorded as regular expression[8].
  • Kleene plus's definition domain is recorded as set[9].
  • Kleene plus's different from is recorded as Kleene star[10].
  • Kleene plus's defining formula is recorded as V^+ = \bigcup_{i \in \mathbb{Z}_+ }V^i \text{; where } V^0 = \epsilon \text{ and } V^i = V^{i - 1} \mathbin{^\frown} V[11].
  • Kleene plus's defining formula is recorded as V^+ = V^* \mathbin{^\frown} V[12].
  • Kleene plus's maintained by WikiProject is recorded as WikiProject Mathematics[13].
  • Kleene plus's in defining formula is recorded as ^+[14].
  • Kleene plus's in defining formula is recorded as \mathbb{Z}_+[15].
  • Kleene plus's in defining formula is recorded as \epsilon[16].
  • Kleene plus's in defining formula is recorded as \mathbin{^\frown}[17].
  • Kleene plus's in defining formula is recorded as ^*[18].

Why It Matters

Kleene plus draws 4 Wikipedia views per month (unary_operation category, ranking #11 of 9).[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.
  3. [5] . wikidata.org.
  4. [6] . wikidata.org.
  5. [7] . wikidata.org.
  6. [8] . wikidata.org.
  7. [9] . wikidata.org.
  8. [10] . wikidata.org.
  9. [11] . wikidata.org.
  10. [12] . wikidata.org.
  11. [13] . wikidata.org.
  12. [14] . wikidata.org.
  13. [15] . wikidata.org.
  14. [16] . wikidata.org.
  15. [17] . wikidata.org.
  16. [18] . 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). Kleene plus. Retrieved May 3, 2026, from https://4ort.xyz/entity/kleene-plus
MLA “Kleene plus.” 4ort.xyz Knowledge Graph, 4ort.xyz, 3 May. 2026, https://4ort.xyz/entity/kleene-plus.
BibTeX @misc{4ortxyz_kleene-plus_2026, author = {{4ort.xyz Knowledge Graph}}, title = {{Kleene plus}}, year = {2026}, url = {https://4ort.xyz/entity/kleene-plus}, note = {Accessed: 2026-05-03}}
LLM prompt According to 4ort.xyz Knowledge Graph (aggregator of Wikidata, Wikipedia, and authoritative open-data sources): Kleene plus — https://4ort.xyz/entity/kleene-plus (retrieved 2026-05-03)

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