Functional analysis

Functional analysis - branch of mathematical analysis concerned with infinite-dimensional topological vector spaces, often spaces of functions. Article "Functional analysis" in Simple English Wikipedia has 29 points for quality (as of July 1, 2025). The article contains 10 references and 3 sections.

This article has the best quality in English Wikipedia. Also, this article is the most popular in that language version.

Since the creation of article "Functional analysis", its content was written by 4 registered users of Simple English Wikipedia and edited by 934 registered Wikipedia users in all languages.

The article is cited 36 times in Simple English Wikipedia and cited 8227 times in all languages.

The highest Authors Interest rank from 2001:

• Local (Simple English): #10029 in December 2021
• Global: #431 in September 2001

The highest popularity rank from 2008:

• Local (Simple English): #9844 in May 2022
• Global: #31966 in July 2022

There are 42 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	English (en) Functional analysis		34.9422
2	Hungarian (hu) Funkcionálanalízis		34.8194
3	Simple English (simple) Functional analysis		29.0358
4	Greek (el) Συναρτησιακή ανάλυση		27.9779
5	Japanese (ja) 関数解析学		27.8026
6	Romanian (ro) Analiză funcțională		25.0253
7	Serbian (sr) Funkcionalna analiza		23.9731
8	Slovak (sk) Funkcionálna analýza		23.3786
9	Estonian (et) Funktsionaalanalüüs		22.4189
10	Chinese (zh) 泛函分析		21.5978

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		2 290 264
2	Spanish (es) Análisis funcional		490 167
3	Russian (ru) Функциональный анализ		442 197
4	German (de) Funktionalanalysis		370 545
5	Chinese (zh) 泛函分析		270 828
6	Polish (pl) Analiza funkcjonalna		261 172
7	French (fr) Analyse fonctionnelle (mathématiques)		248 577
8	Japanese (ja) 関数解析学		225 756
9	Italian (it) Analisi funzionale		214 871
10	Portuguese (pt) Análise funcional		105 103

More...

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 2025

#	Language	Popularity award	Relative popularity
1	English (en) Functional analysis		7 319
2	Russian (ru) Функциональный анализ		1 302
3	Chinese (zh) 泛函分析		983
4	German (de) Funktionalanalysis		916
5	Japanese (ja) 関数解析学		840
6	French (fr) Analyse fonctionnelle (mathématiques)		782
7	Spanish (es) Análisis funcional		766
8	Italian (it) Analisi funzionale		628
9	Polish (pl) Analiza funkcjonalna		579
10	Portuguese (pt) Análise funcional		231

More...

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		161
2	Russian (ru) Функциональный анализ		82
3	French (fr) Analyse fonctionnelle (mathématiques)		70
4	German (de) Funktionalanalysis		68
5	Italian (it) Analisi funzionale		62
6	Hebrew (he) אנליזה פונקציונלית		44
7	Dutch (nl) Functionaalanalyse		41
8	Polish (pl) Analiza funkcjonalna		40
9	Japanese (ja) 関数解析学		35
10	Vietnamese (vi) Giải tích hàm		28

More...

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 2025

#	Language	AI award	Relative AI
1	Belarusian (be) Функцыянальны аналіз		1
2	German (de) Funktionalanalysis		1
3	Persian (fa) آنالیز تابعی		1
4	French (fr) Analyse fonctionnelle (mathématiques)		1
5	Hebrew (he) אנליזה פונקציונלית		1
6	Hungarian (hu) Funkcionálanalízis		1
7	Japanese (ja) 関数解析学		1
8	Arabic (ar) تحليل دالي		0
9	Bulgarian (bg) Функционален анализ		0
10	Catalan (ca) Anàlisi funcional		0

More...

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		1 296
2	German (de) Funktionalanalysis		687
3	French (fr) Analyse fonctionnelle (mathématiques)		543
4	Russian (ru) Функциональный анализ		457
5	Japanese (ja) 関数解析学		436
6	Polish (pl) Analiza funkcjonalna		425
7	Italian (it) Analisi funzionale		380
8	Ukrainian (uk) Функціональний аналіз		356
9	Portuguese (pt) Análise funcional		317
10	Spanish (es) Análisis funcional		312

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
sr	Serbian Funkcionalna analiza
sv	Swedish Funktionalanalys
tr	Turkish Fonksiyonel analiz
uk	Ukrainian Функціональний аналіз
vi	Vietnamese Giải tích hàm
zh	Chinese 泛函分析

Best Rank

Simple English: #9844 05.2022

Global: #31966 07.2022

Best Rank

Simple English: #10029 12.2021

Global: #431 09.2001

On 12 August 2025 in multilingual Wikipedia, Internet users most often read articles on the following topics: Cristiano Ronaldo, Wednesday, Georgina Rodríguez, ChatGPT, Weapons, Jenna Ortega, deaths in 2025, Taylor Swift, Miguel Uribe Turbay, 2025–26 UEFA Champions League.

In Simple English Wikipedia the most popular articles on that day were: Free Republic of Verdis, SOLID (object-oriented design), Wikimedia Foundation, Black, XXXTentacion, List of U.S. states and territories by time zone, Youmna Khoury, List of U.S. states, List of European countries, List of people who have walked on the Moon.

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