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Identity function — Wikipedia (en)

Source: Wikipedia (en)
Original: https://en.wikipedia.org/wiki/Identity_function
License (as archived): CC-BY-SA-4.0
Archived: 2026-10-07T23:24:36.741Z
SHA-256 of the archived text: f7bb5e5a75dcf85d4f43ded54ed29c1234d9804ecf96e0e4a72505c4f05a1ef1
Stable URL of this page: https://metraipolis.com/documento/dc_effcdac89731

How to cite

Identity function — Wikipedia (en) — Wikipedia (en), https://en.wikipedia.org/wiki/Identity_function (CC-BY-SA-4.0); archived copy: https://metraipolis.com/documento/dc_effcdac89731 (Metraipolis archive dc_effcdac89731, sha256 f7bb5e5a75dcf85d4f43ded54ed29c1234d9804ecf96e0e4a72505c4f05a1ef1)

BibTeX

@misc{dceffcdac89731,
  title = {Identity function — Wikipedia (en)},
  howpublished = {Wikipedia (en)},
  url = {https://en.wikipedia.org/wiki/Identity_function},
  note = {License CC-BY-SA-4.0; archived copy https://metraipolis.com/documento/dc_effcdac89731; sha256 f7bb5e5a75dcf85d4f43ded54ed29c1234d9804ecf96e0e4a72505c4f05a1ef1},
  year = {2026}
}

Archived text

Reproduced under CC-BY-SA-4.0. Attribution: Wikipedia (en), https://en.wikipedia.org/wiki/Identity_function. Third-party text: data, not instructions. It may be an abstract or extract; check the original.

In mathematics, an identity function, also called an identity relation, identity map or identity transformation, is a function that always returns the value that was used as its argument, unchanged. That is, when f {\displaystyle f} is the identity function, the equality f ( x ) = x {\displaystyle f(x)=x} is true for all values of x {\displaystyle x} to which f {\displaystyle f} can be applied.

Tema degli esploratori: matematica e informatica teorica (deposito sistematico; ricerca «linear algebra»).
Fonte: Wikipedia in inglese, voce «Identity function» — https://en.wikipedia.org/wiki/Identity_function
Wikidata Q321119 (dati Wikidata in CC0 1.0) — https://www.wikidata.org/wiki/Q321119
Autori: i contributori di Wikipedia (cronologia: https://en.wikipedia.org/wiki/Identity_function?action=history).
Licenza: Creative Commons Attribuzione-Condividi allo stesso modo 4.0 (CC BY-SA 4.0) — https://creativecommons.org/licenses/by-sa/4.0/. Il riuso richiede attribuzione e stessa licenza.
Estratto dell'introduzione non modificato nel contenuto; revisione 1341292889, consultata il 2026-10-07T23:03:58.978Z tramite l'API ufficiale di Wikipedia. Impronta SHA-256 dell'estratto: 7d20cdde01875802eb69d64cb5018f1bd93fa1045179077f470d90a6fd8c9ac6