Problem invarianter Unterräume

de

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Problem invarianter Unterräume

Quality:

Invariant subspace problem - partially-unsolved problem in mathematics. Article “Problem invarianter Unterräume” in German Wikipedia has 27.8 points for quality (as of July 1, 2025). The article contains 6 references and 5 sections.

In this language version of Wikipedia the article has the best quality. However, the most popular language version of this article is English.

Since the creation of article “Problem invarianter Unterräume”, its content was written by 7 registered users of German Wikipedia and edited by 77 registered Wikipedia users in all languages.

The article is cited 2 times in German Wikipedia and cited 540 times in all languages.

The highest Authors Interest rank from 2001:

  • Local (German): #10885 in September 2021
  • Global: #132904 in May 2015

The highest popularity rank from 2008:

  • Local (German): #457061 in June 2023
  • Global: #254102 in August 2024

There are 4 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
1German (de)
Problem invarianter Unterräume
27.8316
2English (en)
Invariant subspace problem
25.3675
3Spanish (es)
Problema del subespacio invariante
12.9905
4Chinese (zh)
不变子空间问题
3.2292
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 "Problem invarianter Unterräume" in all the time
#LanguagePopularity awardRelative popularity
1English (en)
Invariant subspace problem
177 771
2Chinese (zh)
不变子空间问题
14 550
3German (de)
Problem invarianter Unterräume
2 900
4Spanish (es)
Problema del subespacio invariante
552
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 "Problem invarianter Unterräume" in June 2025
#LanguagePopularity awardRelative popularity
1English (en)
Invariant subspace problem
816
2German (de)
Problem invarianter Unterräume
69
3Chinese (zh)
不变子空间问题
56
4Spanish (es)
Problema del subespacio invariante
21
More...

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

The highest AI

Language versions of the article "Problem invarianter Unterräume" with the highest Authors Interest (number of authors). Only registered Wikipedia users were taken into account.
#LanguageAI awardRelative AI
1English (en)
Invariant subspace problem
62
2German (de)
Problem invarianter Unterräume
7
3Chinese (zh)
不变子空间问题
5
4Spanish (es)
Problema del subespacio invariante
3
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 "Problem invarianter Unterräume" with the highest AI in June 2025
#LanguageAI awardRelative AI
1English (en)
Invariant subspace problem
1
2German (de)
Problem invarianter Unterräume
0
3Spanish (es)
Problema del subespacio invariante
0
4Chinese (zh)
不变子空间问题
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 "Problem invarianter Unterräume" with the highest Citation Index (CI)
#LanguageCI awardRelative CI
1English (en)
Invariant subspace problem
444
2Chinese (zh)
不变子空间问题
89
3Spanish (es)
Problema del subespacio invariante
5
4German (de)
Problem invarianter Unterräume
2
More...

Scores

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

Quality measures

Interwikis

#LanguageValue
deGerman
Problem invarianter Unterräume
enEnglish
Invariant subspace problem
esSpanish
Problema del subespacio invariante
zhChinese
不变子空间问题

Popularity rank trends

Best Rank German:
#457061
06.2023
Global:
#254102
08.2024

AI rank trends

Best Rank German:
#10885
09.2021
Global:
#132904
05.2015

Languages comparison

Important global interconnections (July 2024 – June 2025)

Wikipedia readers most often find their way to information on Invariant subspace problem from Wikipedia articles about List of unsolved problems in mathematics, Per Enflo, Invariant subspace, Functional analysis and Enrico Bombieri. Whereas reading the article about Invariant subspace problem people most often go to Wikipedia articles on Per Enflo, Banach space, Axioms, Hilbert space and Nonstandard analysis.

Cumulative results of quality and popularity of the Wikipedia article

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

News from 16 March 2026

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In German Wikipedia the most popular articles on that day were: Oscarverleihung 2026, One Battle After Another, Blood & Sinners, Michael B. Jordan, Jessie Buckley, Jürgen Habermas, Sean Penn, Banksy, Liste der größten Auslegerbrücken, Amy Madigan.

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