Spectrum (functional analysis)

Spectrum - term used in functional analysis. Article “Spectrum (functional analysis)” in English Wikipedia has 33.1 points for quality (as of July 1, 2026). The article contains 6 references and 28 sections. The article also contains templates indicating quality issues, therefore its score was reduced by 1.74 points.

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

Since the creation of article “Spectrum (functional analysis)”, its content was written by 88 registered users of English Wikipedia and edited by 380 registered Wikipedia users in all languages.

The article is cited 379 times in English Wikipedia and cited 1190 times in all languages.

The highest Authors Interest rank from 2001:

• Local (English): #19837 in April 2003
• Global: #26175 in April 2003

The highest popularity rank from 2008:

• Local (English): #247179 in November 2014
• Global: #183610 in January 2015

There are 19 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	German (de) Spektrum (Operatortheorie)		33.2198
2	English (en) Spectrum (functional analysis)		33.0589
3	Catalan (ca) Espectre (matemàtiques)		28.7193
4	Danish (da) Spektrum (funktionsanalyse)		28.5095
5	Korean (ko) 스펙트럼 (함수해석학)		27.9917
6	Chinese (zh) 谱 (泛函分析)		25.2768
7	Italian (it) Spettro (matematica)		24.1321
8	Kazakh (kk) Оператор спектрі		20.9698
9	Spanish (es) Espectro de un operador		19.5917
10	Hebrew (he) ספקטרום (מתמטיקה)		16.06

More...

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

The most popular language versions of the article "Spectrum (functional analysis)" in all the time

#	Language	Popularity award	Relative popularity
1	English (en) Spectrum (functional analysis)		625 108
2	German (de) Spektrum (Operatortheorie)		235 378
3	Russian (ru) Спектр оператора		171 778
4	Spanish (es) Espectro de un operador		102 544
5	Italian (it) Spettro (matematica)		93 547
6	French (fr) Spectre d'un opérateur linéaire		73 280
7	Polish (pl) Widmo (matematyka)		60 564
8	Japanese (ja) スペクトル (関数解析学)		56 776
9	Chinese (zh) 谱 (泛函分析)		19 452
10	Portuguese (pt) Espectro (matemática)		19 336

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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 "Spectrum (functional analysis)" in June 2026

#	Language	Popularity award	Relative popularity
1	English (en) Spectrum (functional analysis)		1 931
2	German (de) Spektrum (Operatortheorie)		598
3	Russian (ru) Спектр оператора		337
4	Japanese (ja) スペクトル (関数解析学)		312
5	Italian (it) Spettro (matematica)		177
6	Chinese (zh) 谱 (泛函分析)		173
7	French (fr) Spectre d'un opérateur linéaire		148
8	Spanish (es) Espectro de un operador		104
9	Polish (pl) Widmo (matematyka)		92
10	Korean (ko) 스펙트럼 (함수해석학)		29

More...

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

Language versions of the article "Spectrum (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) Spectrum (functional analysis)		88
2	German (de) Spektrum (Operatortheorie)		68
3	Russian (ru) Спектр оператора		45
4	Italian (it) Spettro (matematica)		35
5	French (fr) Spectre d'un opérateur linéaire		27
6	Hebrew (he) ספקטרום (מתמטיקה)		26
7	Japanese (ja) スペクトル (関数解析学)		15
8	Polish (pl) Widmo (matematyka)		12
9	Danish (da) Spektrum (funktionsanalyse)		10
10	Swedish (sv) Spektrum (funktionalanalys)		9

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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 "Spectrum (functional analysis)" with the highest AI in June 2026

#	Language	AI award	Relative AI
1	Catalan (ca) Espectre (matemàtiques)		0
2	Danish (da) Spektrum (funktionsanalyse)		0
3	German (de) Spektrum (Operatortheorie)		0
4	English (en) Spectrum (functional analysis)		0
5	Spanish (es) Espectro de un operador		0
6	Persian (fa) طیف (آنالیز تابعی)		0
7	French (fr) Spectre d'un opérateur linéaire		0
8	Hebrew (he) ספקטרום (מתמטיקה)		0
9	Italian (it) Spettro (matematica)		0
10	Japanese (ja) スペクトル (関数解析学)		0

More...

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

Language versions of the article "Spectrum (functional analysis)" with the highest Citation Index (CI)

#	Language	CI award	Relative CI
1	English (en) Spectrum (functional analysis)		379
2	German (de) Spektrum (Operatortheorie)		136
3	Italian (it) Spettro (matematica)		130
4	Chinese (zh) 谱 (泛函分析)		96
5	Japanese (ja) スペクトル (関数解析学)		94
6	Russian (ru) Спектр оператора		66
7	Korean (ko) 스펙트럼 (함수해석학)		54
8	Spanish (es) Espectro de un operador		53
9	French (fr) Spectre d'un opérateur linéaire		53
10	Polish (pl) Widmo (matematyka)		30

More...

#	Language	Value
ca	Catalan Espectre (matemàtiques)
da	Danish Spektrum (funktionsanalyse)
de	German Spektrum (Operatortheorie)
en	English Spectrum (functional analysis)
es	Spanish Espectro de un operador
fa	Persian طیف (آنالیز تابعی)
fr	French Spectre d'un opérateur linéaire
he	Hebrew ספקטרום (מתמטיקה)
it	Italian Spettro (matematica)
ja	Japanese スペクトル (関数解析学)
kk	Kazakh Оператор спектрі
ko	Korean 스펙트럼 (함수해석학)
nl	Dutch Spectrum (functionaalanalyse)
pl	Polish Widmo (matematyka)
pt	Portuguese Espectro (matemática)
ru	Russian Спектр оператора
sv	Swedish Spektrum (funktionalanalys)
uk	Ukrainian Спектр оператора
zh	Chinese 谱 (泛函分析)

Best Rank

English: #247179 11.2014

Global: #183610 01.2015

Best Rank

English: #19837 04.2003

Global: #26175 04.2003

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.

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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 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