Indicator function

en

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Indicator function

Quality:

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. Article “Indicator function” in English Wikipedia has 30.9 points for quality (as of July 1, 2026). The article contains 11 references and 11 sections. The article also contains templates indicating quality issues, therefore its score was reduced by 1.63 points.

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

Since the creation of article “Indicator function”, its content was written by 119 registered users of English Wikipedia and edited by 535 registered Wikipedia users in all languages.

The article is cited 310 times in English Wikipedia and cited 1723 times in all languages.

The highest Authors Interest rank from 2001:

  • Local (English): #9926 in March 2004
  • Global: #19120 in June 2003

The highest popularity rank from 2008:

  • Local (English): #80654 in October 2014
  • Global: #86646 in November 2021

There are 32 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, 2026 (including revision history and pageviews for previous years).

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

Languages with the highest quality

#LanguageQuality gradeQuality score
1Hebrew (he)
פונקציה מציינת
34.5285
2English (en)
Indicator function
30.9146
3Indonesian (id)
Fungsi indikator
25.7297
4Kazakh (kk)
Сипаттауыш функция
20.2109
5Polish (pl)
Funkcja charakterystyczna zbioru
19.1527
6Armenian (hy)
Վեկտորի ինդիկատոր
17.3221
7German (de)
Indikatorfunktion
15.8141
8Ukrainian (uk)
Характеристична функція
15.3092
9Korean (ko)
지시 함수
14.8515
10Galician (gl)
Función indicadora
11.803
More...

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

Most popular in all the time

The most popular language versions of the article "Indicator function" in all the time
#LanguagePopularity awardRelative popularity
1English (en)
Indicator function
1 846 801
2French (fr)
Fonction caractéristique (théorie des ensembles)
220 388
3German (de)
Indikatorfunktion
188 723
4Japanese (ja)
指示関数
162 232
5Russian (ru)
Индикатор (математика)
135 820
6Chinese (zh)
指示函数
118 646
7Italian (it)
Funzione indicatrice
115 833
8Spanish (es)
Función indicatriz
91 019
9Polish (pl)
Funkcja charakterystyczna zbioru
74 086
10Korean (ko)
지시 함수
44 322
More...

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

Most popular in June 2026

The most popular language versions of the article "Indicator function" in June 2026
#LanguagePopularity awardRelative popularity
1English (en)
Indicator function
3 571
2German (de)
Indikatorfunktion
470
3Japanese (ja)
指示関数
462
4French (fr)
Fonction caractéristique (théorie des ensembles)
311
5Chinese (zh)
指示函数
275
6Russian (ru)
Индикатор (математика)
190
7Spanish (es)
Función indicatriz
163
8Italian (it)
Funzione indicatrice
146
9Polish (pl)
Funkcja charakterystyczna zbioru
133
10Hebrew (he)
פונקציה מציינת
48
More...

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

The highest AI

Language versions of the article "Indicator function" with the highest Authors Interest (number of authors). Only registered Wikipedia users were taken into account.
#LanguageAI awardRelative AI
1English (en)
Indicator function
119
2German (de)
Indikatorfunktion
63
3French (fr)
Fonction caractéristique (théorie des ensembles)
42
4Italian (it)
Funzione indicatrice
33
5Russian (ru)
Индикатор (математика)
32
6Japanese (ja)
指示関数
29
7Hebrew (he)
פונקציה מציינת
28
8Polish (pl)
Funkcja charakterystyczna zbioru
23
9Dutch (nl)
Indicatorfunctie
22
10Finnish (fi)
Indikaattorifunktio
15
More...

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

The highest AI in June 2026

Language versions of the article "Indicator function" with the highest AI in June 2026
#LanguageAI awardRelative AI
1Basque (eu)
Funtzio adierazle
1
2Italian (it)
Funzione indicatrice
1
3Thai (th)
ฟังก์ชันบ่งชี้
1
4Bulgarian (bg)
Индикаторна функция
0
5Catalan (ca)
Funció característica (matemàtiques)
0
6Czech (cs)
Charakteristická funkce
0
7Danish (da)
Indikatorfunktion
0
8German (de)
Indikatorfunktion
0
9English (en)
Indicator function
0
10Spanish (es)
Función indicatriz
0
More...

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

The highest CI

Language versions of the article "Indicator function" with the highest Citation Index (CI)
#LanguageCI awardRelative CI
1English (en)
Indicator function
310
2Japanese (ja)
指示関数
171
3French (fr)
Fonction caractéristique (théorie des ensembles)
143
4Korean (ko)
지시 함수
128
5German (de)
Indikatorfunktion
119
6Polish (pl)
Funkcja charakterystyczna zbioru
116
7Italian (it)
Funzione indicatrice
75
8Ukrainian (uk)
Характеристична функція
66
9Russian (ru)
Индикатор (математика)
65
10Chinese (zh)
指示函数
64
More...

Scores

Estimated value for Wikipedia:
English:
Global:
Popularity in June 2026:
English:
Global:
Popularity in all years:
English:
Global:
Authors in June 2026:
English:
Global:
Registered authors in all years:
English:
Global:
Citations:
English:
Global:

Quality measures

Interwikis

#LanguageValue
bgBulgarian
Индикаторна функция
caCatalan
Funció característica (matemàtiques)
csCzech
Charakteristická funkce
daDanish
Indikatorfunktion
deGerman
Indikatorfunktion
enEnglish
Indicator function
esSpanish
Función indicatriz
euBasque
Funtzio adierazle
faPersian
تابع مشخصه
fiFinnish
Indikaattorifunktio
frFrench
Fonction caractéristique (théorie des ensembles)
glGalician
Función indicadora
heHebrew
פונקציה מציינת
hiHindi
सूचक फलन
huHungarian
Karakterisztikus függvény
hyArmenian
Վեկտորի ինդիկատոր
idIndonesian
Fungsi indikator
itItalian
Funzione indicatrice
jaJapanese
指示関数
kkKazakh
Сипаттауыш функция
koKorean
지시 함수
msMalay
Fungsi penunjuk
nlDutch
Indicatorfunctie
plPolish
Funkcja charakterystyczna zbioru
ptPortuguese
Função indicadora
ruRussian
Индикатор (математика)
srSerbian
Функција индикатор
taTamil
சுட்டுச் சார்பு
thThai
ฟังก์ชันบ่งชี้
ukUkrainian
Характеристична функція
viVietnamese
Hàm chỉ thị
zhChinese
指示函数

Popularity rank trends

Best Rank English:
#80654
10.2014
Global:
#86646
11.2021

AI rank trends

Best Rank English:
#9926
03.2004
Global:
#19120
06.2003

Local AI rank history

Languages comparison

Important global interconnections (July 2025 – June 2026)

Wikipedia readers most often find their way to information on Indicator function from Wikipedia articles about Characteristic function, Lebesgue integration, Fonction indicatrice, Heaviside step function and Dirichlet function. Whereas reading the article about Indicator function people most often go to Wikipedia articles on Iverson bracket, Dirichlet function, Characteristic function, Heaviside step function and Laplacian of the indicator.

Cumulative results of quality and popularity of the Wikipedia article

List of Wikipedia articles in different languages (starting with the most popular):

News from 1 July 2026

On 1 July 2026 in multilingual Wikipedia, Internet users most often read articles on the following topics: 2026 FIFA World Cup, Kylian Mbappé, Erling Haaland, Democratic Republic of the Congo, FIFA World Cup, Harry Kane, Romelu Lukaku, Senegal, Michael Olise, Sadio Mané.

In English Wikipedia the most popular articles on that day were: 2026 FIFA World Cup, Harry Kane, Julián Quiñones, List of FIFA World Cup top goalscorers, Kylian Mbappé, Democratic Republic of the Congo, Erling Haaland, DR Congo national football team, Melat Kiros, FIFA World Cup.

About WikiRank

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 50 million Wikipedia articles in 55 languages. Quality scores of articles are based on Wikipedia dumps from July, 2026. When calculating current popularity and AI of articles data from June 2026 was taken into account. For historical values of popularity and AI WikiRank used data from 2001 to 2026... More information