Functional analysis

Functional analysis - branch of mathematical analysis concerned with infinite-dimensional topological vector spaces, often spaces of functions. Article “Functional analysis” in English Wikipedia has 34.9 points for quality (as of July 1, 2026). The article contains 10 references and 17 sections. The article also contains templates indicating quality issues, therefore its score was reduced by 1.84 points.

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

Since the creation of article “Functional analysis”, its content was written by 162 registered users of English Wikipedia and edited by 961 registered Wikipedia users in all languages.

The article is cited 1317 times in English Wikipedia and cited 8705 times in all languages.

The highest Authors Interest rank from 2001:

• Local (English): #338 in September 2001
• Global: #435 in September 2001

The highest popularity rank from 2008:

• Local (English): #43185 in July 2022
• Global: #31968 in July 2022

There are 44 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.

#	Language	Quality grade	Quality score
1	Japanese (ja) 関数解析学		34.9814
2	English (en) Functional analysis		34.8634
3	Hungarian (hu) Funkcionálanalízis		34.7683
4	Catalan (ca) Anàlisi funcional		32.5201
5	Simple English (simple) Functional analysis		28.2486
6	Greek (el) Συναρτησιακή ανάλυση		28.1266
7	Romanian (ro) Analiză funcțională		24.978
8	Serbian (sr) Funkcionalna analiza		23.2387
9	Slovak (sk) Funkcionálna analýza		22.6168
10	Estonian (et) Funktsionaalanalüüs		22.363

More...

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

The most popular language versions of the article "Functional analysis" in all the time

#	Language	Popularity award	Relative popularity
1	English (en) Functional analysis		2 379 907
2	Spanish (es) Análisis funcional		498 242
3	Russian (ru) Функциональный анализ		480 802
4	German (de) Funktionalanalysis		386 797
5	Chinese (zh) 泛函分析		282 390
6	Polish (pl) Analiza funkcjonalna		269 652
7	French (fr) Analyse fonctionnelle (mathématiques)		258 586
8	Japanese (ja) 関数解析学		235 704
9	Italian (it) Analisi funzionale		221 300
10	Portuguese (pt) Análise funcional		108 010

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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 "Functional analysis" in June 2026

#	Language	Popularity award	Relative popularity
1	English (en) Functional analysis		5 570
2	Russian (ru) Функциональный анализ		980
3	German (de) Funktionalanalysis		840
4	Japanese (ja) 関数解析学		744
5	Chinese (zh) 泛函分析		721
6	French (fr) Analyse fonctionnelle (mathématiques)		589
7	Polish (pl) Analiza funkcjonalna		467
8	Spanish (es) Análisis funcional		401
9	Italian (it) Analisi funzionale		366
10	Portuguese (pt) Análise funcional		207

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

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

#	Language	AI award	Relative AI
1	English (en) Functional analysis		162
2	Russian (ru) Функциональный анализ		83
3	French (fr) Analyse fonctionnelle (mathématiques)		70
4	German (de) Funktionalanalysis		69
5	Italian (it) Analisi funzionale		63
6	Hebrew (he) אנליזה פונקציונלית		44
7	Dutch (nl) Functionaalanalyse		41
8	Polish (pl) Analiza funkcjonalna		41
9	Japanese (ja) 関数解析学		39
10	Vietnamese (vi) Giải tích hàm		29

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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 "Functional analysis" with the highest AI in June 2026

#	Language	AI award	Relative AI
1	Arabic (ar) تحليل دالي		1
2	Basque (eu) Analisi funtzional		1
3	Polish (pl) Analiza funkcjonalna		1
4	Portuguese (pt) Análise funcional		1
5	Belarusian (be) Функцыянальны аналіз		0
6	Bulgarian (bg) Функционален анализ		0
7	Catalan (ca) Anàlisi funcional		0
8	Czech (cs) Funkcionální analýza		0
9	Danish (da) Funktionalanalyse		0
10	German (de) Funktionalanalysis		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 "Functional analysis" with the highest Citation Index (CI)

#	Language	CI award	Relative CI
1	English (en) Functional analysis		1 317
2	German (de) Funktionalanalysis		707
3	French (fr) Analyse fonctionnelle (mathématiques)		552
4	Polish (pl) Analiza funkcjonalna		539
5	Japanese (ja) 関数解析学		462
6	Russian (ru) Функциональный анализ		462
7	Italian (it) Analisi funzionale		382
8	Ukrainian (uk) Функціональний аналіз		367
9	Chinese (zh) 泛函分析		337
10	Portuguese (pt) Análise funcional		327

More...

#	Language	Value
ar	Arabic تحليل دالي
be	Belarusian Функцыянальны аналіз
bg	Bulgarian Функционален анализ
ca	Catalan Anàlisi funcional
cs	Czech Funkcionální analýza
da	Danish Funktionalanalyse
de	German Funktionalanalysis
el	Greek Συναρτησιακή ανάλυση
en	English Functional analysis
es	Spanish Análisis funcional
et	Estonian Funktsionaalanalüüs
eu	Basque Analisi funtzional
fa	Persian آنالیز تابعی
fi	Finnish Funktionaalianalyysi
fr	French Analyse fonctionnelle (mathématiques)
gl	Galician Análise funcional
he	Hebrew אנליזה פונקציונלית
hi	Hindi फलन विश्लेषण
hu	Hungarian Funkcionálanalízis
hy	Armenian Ֆունկցիոնալ անալիզ
id	Indonesian Analisis fungsional
it	Italian Analisi funzionale
ja	Japanese 関数解析学
ka	Georgian ფუნქციონალური ანალიზი
kk	Kazakh Функционалдық талдау
ko	Korean 함수해석학
ms	Malay Analisis fungsi
nl	Dutch Functionaalanalyse
nn	Norwegian (Nynorsk) Funksjonalanalyse
no	Norwegian Funksjonalanalyse
pl	Polish Analiza funkcjonalna
pt	Portuguese Análise funcional
ro	Romanian Analiză funcțională
ru	Russian Функциональный анализ
simple	Simple English Functional analysis
sk	Slovak Funkcionálna analýza
sl	Slovenian Funkcionalna analiza
sr	Serbian Funkcionalna analiza
sv	Swedish Funktionalanalys
th	Thai การวิเคราะห์เชิงฟังก์ชัน
tr	Turkish Fonksiyonel analiz
uk	Ukrainian Функціональний аналіз
vi	Vietnamese Giải tích hàm
zh	Chinese 泛函分析

Best Rank

English: #43185 07.2022

Global: #31968 07.2022

Best Rank

English: #338 09.2001

Global: #435 09.2001

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.

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