Теорема про причісування їжака

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Теорема про причісування їжака

Quality:

Hairy ball theorem - theorem which states that there is no nonvanishing continuous tangent vector field on even-dimensional n-spheres. Article “Теорема про причісування їжака” in Ukrainian Wikipedia has 2.5 points for quality (as of July 1, 2025).

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

Since the creation of article “Теорема про причісування їжака”, its content was written by 3 registered users of Ukrainian Wikipedia and edited by 510 registered Wikipedia users in all languages.

The article is cited 4 times in Ukrainian Wikipedia and cited 289 times in all languages.

The highest Authors Interest rank from 2001:

  • Local (Ukrainian): #45506 in January 2021
  • Global: #7046 in August 2005

The highest popularity rank from 2008:

  • Local (Ukrainian): #156569 in April 2025
  • Global: #14658 in February 2016

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, 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
1Catalan (ca)
Teorema de la bola peluda
49.4751
2French (fr)
Théorème de la boule chevelue
46.069
3Spanish (es)
Teorema de la bola peluda
41.1795
4English (en)
Hairy ball theorem
38.9165
5Hebrew (he)
משפט הכדור השעיר
32.7545
6German (de)
Satz vom Igel
27.5966
7Chinese (zh)
毛球定理
24.4073
8Persian (fa)
قضیه توپ مودار
21.132
9Portuguese (pt)
Teorema da bola cabeluda
20.2692
10Japanese (ja)
毛玉の定理
20.1935
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 "Теорема про причісування їжака" in all the time
#LanguagePopularity awardRelative popularity
1English (en)
Hairy ball theorem
2 233 545
2Russian (ru)
Теорема о причёсывании ежа
225 929
3Italian (it)
Teorema della palla pelosa
148 936
4French (fr)
Théorème de la boule chevelue
119 067
5German (de)
Satz vom Igel
117 633
6Spanish (es)
Teorema de la bola peluda
88 116
7Portuguese (pt)
Teorema da bola cabeluda
58 230
8Chinese (zh)
毛球定理
47 727
9Hebrew (he)
משפט הכדור השעיר
7 464
10Hungarian (hu)
Sündisznótétel
6 403
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 "Теорема про причісування їжака" in June 2025
#LanguagePopularity awardRelative popularity
1English (en)
Hairy ball theorem
14 481
2Russian (ru)
Теорема о причёсывании ежа
1 254
3Italian (it)
Teorema della palla pelosa
472
4French (fr)
Théorème de la boule chevelue
447
5Spanish (es)
Teorema de la bola peluda
385
6German (de)
Satz vom Igel
341
7Chinese (zh)
毛球定理
312
8Portuguese (pt)
Teorema da bola cabeluda
302
9Japanese (ja)
毛玉の定理
213
10Hebrew (he)
משפט הכדור השעיר
86
More...

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

The highest AI

Language versions of the article "Теорема про причісування їжака" with the highest Authors Interest (number of authors). Only registered Wikipedia users were taken into account.
#LanguageAI awardRelative AI
1English (en)
Hairy ball theorem
247
2French (fr)
Théorème de la boule chevelue
68
3Russian (ru)
Теорема о причёсывании ежа
42
4German (de)
Satz vom Igel
34
5Italian (it)
Teorema della palla pelosa
27
6Portuguese (pt)
Teorema da bola cabeluda
14
7Chinese (zh)
毛球定理
12
8Esperanto (eo)
Teoremo pri erinaco
9
9Danish (da)
Sætningen om den behårede kugle
7
10Spanish (es)
Teorema de la bola peluda
7
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 "Теорема про причісування їжака" with the highest AI in June 2025
#LanguageAI awardRelative AI
1Galician (gl)
Teorema da bóla peluda
4
2English (en)
Hairy ball theorem
2
3Hebrew (he)
משפט הכדור השעיר
1
4Catalan (ca)
Teorema de la bola peluda
0
5Danish (da)
Sætningen om den behårede kugle
0
6German (de)
Satz vom Igel
0
7Esperanto (eo)
Teoremo pri erinaco
0
8Spanish (es)
Teorema de la bola peluda
0
9Persian (fa)
قضیه توپ مودار
0
10Finnish (fi)
Karvapallolause
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 "Теорема про причісування їжака" with the highest Citation Index (CI)
#LanguageCI awardRelative CI
1Italian (it)
Teorema della palla pelosa
144
2English (en)
Hairy ball theorem
44
3French (fr)
Théorème de la boule chevelue
20
4German (de)
Satz vom Igel
15
5Russian (ru)
Теорема о причёсывании ежа
11
6Catalan (ca)
Teorema de la bola peluda
8
7Hebrew (he)
משפט הכדור השעיר
8
8Chinese (zh)
毛球定理
7
9Spanish (es)
Teorema de la bola peluda
6
10Persian (fa)
قضیه توپ مودار
6
More...

Scores

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

Quality measures

Interwikis

#LanguageValue
caCatalan
Teorema de la bola peluda
daDanish
Sætningen om den behårede kugle
deGerman
Satz vom Igel
enEnglish
Hairy ball theorem
eoEsperanto
Teoremo pri erinaco
esSpanish
Teorema de la bola peluda
faPersian
قضیه توپ مودار
fiFinnish
Karvapallolause
frFrench
Théorème de la boule chevelue
glGalician
Teorema da bóla peluda
heHebrew
משפט הכדור השעיר
huHungarian
Sündisznótétel
itItalian
Teorema della palla pelosa
jaJapanese
毛玉の定理
ptPortuguese
Teorema da bola cabeluda
ruRussian
Теорема о причёсывании ежа
svSwedish
Igelkottsteoremet
ukUkrainian
Теорема про причісування їжака
zhChinese
毛球定理

Popularity rank trends

Best Rank Ukrainian:
#156569
04.2025
Global:
#14658
02.2016

AI rank trends

Best Rank Ukrainian:
#45506
01.2021
Global:
#7046
08.2005

Global AI rank history

Languages comparison

Important global interconnections (July 2024 – June 2025)

Wikipedia readers most often find their way to information on Hairy ball theorem from Wikipedia articles about Topology, Cowlick, Brouwer fixed-point theorem, Hair whorl and Vector bundle. Whereas reading the article about Hairy ball theorem people most often go to Wikipedia articles on Cowlick, Hair whorl, Poincaré–Hopf theorem, N-sphere and Algebraic topology.

Cumulative results of quality and popularity of the Wikipedia article

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

News from 7 October 2025

On 7 October 2025 in multilingual Wikipedia, Internet users most often read articles on the following topics: Ed Gein, Ilse Koch, Lizzie Borden, Anthony Perkins, Monster: The Ed Gein Story, Greta Thunberg, Richard Speck, Psycho, ChatGPT, Charlie Hunnam.

In Ukrainian Wikipedia the most popular articles on that day were: Бондарєва-Рєпіна Олена Володимирівна, Tomahawk (ракета), Ед Ґейн, Путін Володимир Володимирович, Арестович Олексій Миколайович, Typhon (пускова установка), Шепітько Лариса Юхимівна, Кабаєва Аліна Маратівна, Чудовисько: Історія Еда Ґіна, Вовчанчин Ігор Ярославович.

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