Indefinite inner product space

en

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Indefinite inner product space

Quality:

Krein space - generalization of Hilbert space with indefinite signature. Article “Indefinite inner product space” in English Wikipedia has 13 points for quality (as of July 1, 2025). The article contains 0 references and 6 sections.

In this language version of Wikipedia the article has the best quality. Also, this article is the most popular in that (English) language version.

Since the creation of article “Indefinite inner product space”, its content was written by 26 registered users of English Wikipedia and edited by 53 registered Wikipedia users in all languages.

The article is cited 16 times in English Wikipedia and cited 22 times in all languages.

The highest Authors Interest rank from 2001:

  • Local (English): #33390 in June 2006
  • Global: #46911 in June 2006

The highest popularity rank from 2008:

  • Local (English): #847748 in May 2008
  • Global: #1134782 in May 2008

There are 2 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
1English (en)
Indefinite inner product space
13.0334
2German (de)
Kreinraum
7.6078
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 "Indefinite inner product space" in all the time
#LanguagePopularity awardRelative popularity
1English (en)
Indefinite inner product space
63 063
2German (de)
Kreinraum
11 644
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 "Indefinite inner product space" in June 2025
#LanguagePopularity awardRelative popularity
1English (en)
Indefinite inner product space
311
2German (de)
Kreinraum
36
More...

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

The highest AI

Language versions of the article "Indefinite inner product space" with the highest Authors Interest (number of authors). Only registered Wikipedia users were taken into account.
#LanguageAI awardRelative AI
1German (de)
Kreinraum
27
2English (en)
Indefinite inner product space
26
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 "Indefinite inner product space" with the highest AI in June 2025
#LanguageAI awardRelative AI
1German (de)
Kreinraum
0
2English (en)
Indefinite inner product space
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 "Indefinite inner product space" with the highest Citation Index (CI)
#LanguageCI awardRelative CI
1English (en)
Indefinite inner product space
16
2German (de)
Kreinraum
6
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
Kreinraum
enEnglish
Indefinite inner product space

Popularity rank trends

Best Rank English:
#847748
05.2008
Global:
#1134782
05.2008

AI rank trends

Best Rank English:
#33390
06.2006
Global:
#46911
06.2006

Languages comparison

Important global interconnections (July 2024 – June 2025)

Wikipedia readers most often find their way to information on Krein space from Wikipedia articles about Inner product space, Quasiprobability distribution, Mark Krein, Degenerate bilinear form and Lev Pontryagin. Whereas reading the article about Krein space people most often go to Wikipedia articles on Definite quadratic form, Inner product space, Mark Krein, Sesquilinear form and Quasiprobability distribution.

Cumulative results of quality and popularity of the Wikipedia article

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

News from 21 February 2026

On 21 February 2026 in multilingual Wikipedia, Internet users most often read articles on the following topics: Jeffrey Epstein, Alysa Liu, Eric Dane, 2026 Winter Olympics, Rebecca Gayheart, Johannes Høsflot Klæbo, Wuthering Heights, amyotrophic lateral sclerosis, Andrew Mountbatten-Windsor, John F. Kennedy Jr..

In English Wikipedia the most popular articles on that day were: Eric Dane, Alysa Liu, Rebecca Gayheart, Jeffrey Epstein, 2026 Winter Olympics, Eileen Gu, John F. Kennedy Jr., Carolyn Bessette Kennedy, Deaths in 2026, Johannes Høsflot Klæbo.

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