Identity function

Identity function - function that always returns the same value that was used as its argument. Article "Identity function" in English Wikipedia has 28.7 points for quality (as of July 1, 2025). The article contains 11 references and 5 sections.

This article has the best quality in Greek Wikipedia. However, this article is the most popular in English version.

In June 2025 the article "Identity function" was edited by 1 authors in English Wikipedia and written by 4 authors in all languages.

Since the creation of article "Identity function", its content was written by 84 registered users of English Wikipedia and edited by 609 registered Wikipedia users in all languages.

The article is cited 357 times in English Wikipedia and cited 2632 times in all languages.

The highest Authors Interest rank from 2001:

• Local (English): #429 in February 2002
• Global: #558 in February 2002

The highest popularity rank from 2008:

• Local (English): #115038 in October 2010
• Global: #75725 in November 2012

There are 36 language versions for this article in the WikiRank database (of the considered 55 Wikipedia language editions).

The quality and popularity assessment was based on Wikipédia dumps from July 1, 2025 (including revision history and pageviews for previous years).

The table below shows the language versions of the article with the highest quality.

#	Language	Quality grade	Quality score
1	Greek (el) Ταυτοτική συνάρτηση		32.3897
2	English (en) Identity function		28.7085
3	Persian (fa) تابع همانی		25.0589
4	Romanian (ro) Identitate (matematică)		24.2272
5	Estonian (et) Samasusteisendus		23.5895
6	Portuguese (pt) Função identidade		22.9069
7	Vietnamese (vi) Hàm đồng nhất		21.1812
8	Arabic (ar) دالة مطابقة		19.9179
9	Croatian (hr) Funkcija identiteta		17.5565
10	Ukrainian (uk) Тотожне відображення		17.2387

More...

The following table shows the most popular language versions of the article.

The most popular language versions of the article "Identity function" in all the time

#	Language	Popularity award	Relative popularity
1	English (en) Identity function		1 170 927
2	Spanish (es) Función identidad		804 100
3	German (de) Identische Abbildung		293 507
4	French (fr) Application identité		169 730
5	Japanese (ja) 恒等写像		134 795
6	Persian (fa) تابع همانی		115 692
7	Portuguese (pt) Função identidade		114 837
8	Turkish (tr) Birim fonksiyon		111 561
9	Polish (pl) Funkcja tożsamościowa		106 655
10	Italian (it) Funzione identità		97 373

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The following table shows the language versions of the article with the highest popularity in the last month.

The most popular language versions of the article "Identity function" in June 2025

#	Language	Popularity award	Relative popularity
1	English (en) Identity function		3 544
2	Japanese (ja) 恒等写像		373
3	Russian (ru) Тождественное отображение		343
4	German (de) Identische Abbildung		326
5	Spanish (es) Función identidad		281
6	French (fr) Application identité		221
7	Chinese (zh) 恆等函數		192
8	Persian (fa) تابع همانی		191
9	Italian (it) Funzione identità		139
10	Korean (ko) 항등 함수		131

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The following table shows the language versions of the article with the highest Authors’ Interest.

Language versions of the article "Identity function" with the highest Authors Interest (number of authors). Only registered Wikipedia users were taken into account.

#	Language	AI award	Relative AI
1	English (en) Identity function		84
2	French (fr) Application identité		56
3	German (de) Identische Abbildung		52
4	Italian (it) Funzione identità		39
5	Russian (ru) Тождественное отображение		34
6	Dutch (nl) Identieke afbeelding		32
7	Spanish (es) Función identidad		28
8	Turkish (tr) Birim fonksiyon		27
9	Danish (da) Identitetsfunktion		25
10	Persian (fa) تابع همانی		22

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The following table shows the language versions of the article with the highest Authors’ Interest in the last month.

Language versions of the article "Identity function" with the highest AI in June 2025

#	Language	AI award	Relative AI
1	English (en) Identity function		1
2	Italian (it) Funzione identità		1
3	Polish (pl) Funkcja tożsamościowa		1
4	Ukrainian (uk) Тотожне відображення		1
5	Arabic (ar) دالة مطابقة		0
6	Catalan (ca) Funció identitat		0
7	Czech (cs) Identita (matematika)		0
8	Danish (da) Identitetsfunktion		0
9	German (de) Identische Abbildung		0
10	Greek (el) Ταυτοτική συνάρτηση		0

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The following table shows the language versions of the article with the highest number of citations.

Language versions of the article "Identity function" with the highest Citation Index (CI)

#	Language	CI award	Relative CI
1	English (en) Identity function		357
2	Polish (pl) Funkcja tożsamościowa		285
3	Korean (ko) 항등 함수		214
4	German (de) Identische Abbildung		201
5	French (fr) Application identité		185
6	Japanese (ja) 恒等写像		176
7	Spanish (es) Función identidad		118
8	Portuguese (pt) Função identidade		116
9	Chinese (zh) 恆等函數		104
10	Italian (it) Funzione identità		87

More...

#	Language	Value
ar	Arabic دالة مطابقة
ca	Catalan Funció identitat
cs	Czech Identita (matematika)
da	Danish Identitetsfunktion
de	German Identische Abbildung
el	Greek Ταυτοτική συνάρτηση
en	English Identity function
eo	Esperanto Identa funkcio
es	Spanish Función identidad
et	Estonian Samasusteisendus
eu	Basque Identitate funtzio
fa	Persian تابع همانی
fi	Finnish Identiteettifunktio
fr	French Application identité
gl	Galician Función identidade
he	Hebrew פונקציית הזהות
hi	Hindi तत्समक फलन
hr	Croatian Funkcija identiteta
id	Indonesian Fungsi identitas
it	Italian Funzione identità
ja	Japanese 恒等写像
ko	Korean 항등 함수
nl	Dutch Identieke afbeelding
pl	Polish Funkcja tożsamościowa
pt	Portuguese Função identidade
ro	Romanian Identitate (matematică)
ru	Russian Тождественное отображение
simple	Simple English Identity function
sl	Slovenian Identična funkcija
sv	Swedish Identitetsfunktion
ta	Tamil முற்றொருமைச் சார்பு
th	Thai ฟังก์ชันเอกลักษณ์
tr	Turkish Birim fonksiyon
uk	Ukrainian Тотожне відображення
vi	Vietnamese Hàm đồng nhất
zh	Chinese 恆等函數

Best Rank

English: #115038 10.2010

Global: #75725 11.2012

Best Rank

English: #429 02.2002

Global: #558 02.2002

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The WikiRank project is intended for automatic relative evaluation of the articles in the various language versions of Wikipedia. At the moment the service allows to compare over 44 million Wikipedia articles in 55 languages. Quality scores of articles are based on Wikipedia dumps from July, 2025. When calculating current popularity and AI of articles data from June 2025 was taken into account. For historical values of popularity and AI WikiRank used data from 2001 to 2025... More information