Functional calculus

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Functional calculus

Quality:

Functional calculus - theory allowing one to apply mathematical functions to mathematical operators. Article “Functional calculus” in English Wikipedia has 5.8 points for quality (as of July 1, 2025). The article contains 0 references and 3 sections.

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

Since the creation of article “Functional calculus”, its content was written by 19 registered users of English Wikipedia and edited by 64 registered Wikipedia users in all languages.

The article is cited 456 times in English Wikipedia and cited 639 times in all languages.

The highest Authors Interest rank from 2001:

  • Local (English): #113436 in May 2015
  • Global: #221720 in February 2023

The highest popularity rank from 2008:

  • Local (English): #617401 in July 2020
  • Global: #957934 in July 2020

There are 8 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.

Languages with the highest quality

#LanguageQuality gradeQuality score
1Chinese (zh)
函数演算
12.3576
2Russian (ru)
Функциональное исчисление
10.1025
3English (en)
Functional calculus
5.8009
4German (de)
Funktionalkalkül
5.6355
5Dutch (nl)
Functionele calculus
5.3797
6Japanese (ja)
汎函数計算
4.4676
7Korean (ko)
범함수 미적분학
3.6621
8French (fr)
Calcul fonctionnel
3.0966
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 "Functional calculus" in all the time
#LanguagePopularity awardRelative popularity
1English (en)
Functional calculus
147 687
2German (de)
Funktionalkalkül
20 495
3French (fr)
Calcul fonctionnel
9 598
4Japanese (ja)
汎函数計算
7 077
5Dutch (nl)
Functionele calculus
5 931
6Russian (ru)
Функциональное исчисление
808
7Chinese (zh)
函数演算
808
8Korean (ko)
범함수 미적분학
376
More...

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

Most popular in June 2025

The most popular language versions of the article "Functional calculus" in June 2025
#LanguagePopularity awardRelative popularity
1English (en)
Functional calculus
973
2German (de)
Funktionalkalkül
86
3French (fr)
Calcul fonctionnel
81
4Japanese (ja)
汎函数計算
57
5Chinese (zh)
函数演算
55
6Russian (ru)
Функциональное исчисление
32
7Korean (ko)
범함수 미적분학
14
8Dutch (nl)
Functionele calculus
10
More...

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

The highest AI

Language versions of the article "Functional calculus" with the highest Authors Interest (number of authors). Only registered Wikipedia users were taken into account.
#LanguageAI awardRelative AI
1English (en)
Functional calculus
19
2German (de)
Funktionalkalkül
11
3French (fr)
Calcul fonctionnel
10
4Dutch (nl)
Functionele calculus
10
5Japanese (ja)
汎函数計算
6
6Russian (ru)
Функциональное исчисление
4
7Korean (ko)
범함수 미적분학
3
8Chinese (zh)
函数演算
1
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 2025

Language versions of the article "Functional calculus" with the highest AI in June 2025
#LanguageAI awardRelative AI
1German (de)
Funktionalkalkül
0
2English (en)
Functional calculus
0
3French (fr)
Calcul fonctionnel
0
4Japanese (ja)
汎函数計算
0
5Korean (ko)
범함수 미적분학
0
6Dutch (nl)
Functionele calculus
0
7Russian (ru)
Функциональное исчисление
0
8Chinese (zh)
函数演算
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 "Functional calculus" with the highest Citation Index (CI)
#LanguageCI awardRelative CI
1English (en)
Functional calculus
456
2Chinese (zh)
函数演算
86
3Japanese (ja)
汎函数計算
58
4German (de)
Funktionalkalkül
14
5Korean (ko)
범함수 미적분학
12
6French (fr)
Calcul fonctionnel
9
7Dutch (nl)
Functionele calculus
3
8Russian (ru)
Функциональное исчисление
1
More...

Scores

Estimated value for Wikipedia:
English:
Global:
Popularity in June 2025:
English:
Global:
Popularity in all years:
English:
Global:
Authors in June 2025:
English:
Global:
Registered authors in all years:
English:
Global:
Citations:
English:
Global:

Quality measures

Interwikis

#LanguageValue
deGerman
Funktionalkalkül
enEnglish
Functional calculus
frFrench
Calcul fonctionnel
jaJapanese
汎函数計算
koKorean
범함수 미적분학
nlDutch
Functionele calculus
ruRussian
Функциональное исчисление
zhChinese
函数演算

Popularity rank trends

Best Rank English:
#617401
07.2020
Global:
#957934
07.2020

AI rank trends

Best Rank English:
#113436
05.2015
Global:
#221720
02.2023

Languages comparison

Important global interconnections (July 2024 – June 2025)

Wikipedia readers most often find their way to information on Functional calculus from Wikipedia articles about 2005, Operator theory, Holomorphic functional calculus, Continuous functional calculus and List of formal systems. Whereas reading the article about Functional calculus people most often go to Wikipedia articles on Continuous functional calculus, Borel functional calculus, Holomorphic functional calculus, Spectral theory and Direct integral.

Cumulative results of quality and popularity of the Wikipedia article

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

News from 26 January 2026

On 26 January 2026 in multilingual Wikipedia, Internet users most often read articles on the following topics: killing of Alex Pretti, Alex Honnold, Nipah virus, A Knight of the Seven Kingdoms, Donald Trump, Sam Darnold, Sinners, U.S. Immigration and Customs Enforcement, Marty Supreme, deaths in 2026.

In English Wikipedia the most popular articles on that day were: Sam Darnold, Killing of Alex Pretti, Border 2, Jaxon Smith-Njigba, Gregory Bovino, Republic Day (India), Super Bowl LX, Alex Honnold, List of Super Bowl champions, Suella Braverman.

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 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