Alexander horned sphere

Alexander horned sphere - topological embedding of a 2-dimensional sphere in 3-space whose interior is a 3-ball but whose exterior is not simply connected. Article “Alexander horned sphere” in English Wikipedia has 24.1 points for quality (as of July 1, 2025). The article contains 2 references and 7 sections.

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

Since the creation of article “Alexander horned sphere”, its content was written by 67 registered users of English Wikipedia and edited by 159 registered Wikipedia users in all languages.

The article is cited 30 times in English Wikipedia and cited 218 times in all languages.

The highest Authors Interest rank from 2001:

• Local (English): #20257 in November 2004
• Global: #59943 in November 2004

The highest popularity rank from 2008:

• Local (English): #181402 in December 2019
• Global: #223431 in October 2013

There are 12 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	Greek (el) Κερασφόρος σφαίρα του Αλεξάντερ		26.9346
2	English (en) Alexander horned sphere		24.0907
3	French (fr) Sphère cornue d'Alexander		19.6559
4	Spanish (es) Esfera con cuernos de Alexander		12.3982
5	Japanese (ja) アレクサンダーの角付き球面		11.3739
6	Arabic (ar) كرة ألكسندر القرنية		7.9716
7	Italian (it) Sfera di Alexander		7.3727
8	Russian (ru) Рогатая сфера Александера		6.5509
9	Korean (ko) 알렉산더의 뿔 달린 구		5.6264
10	Catalan (ca) Esfera banyuda d'Alexander		4.5735

More...

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

The most popular language versions of the article "Alexander horned sphere" in all the time

#	Language	Popularity award	Relative popularity
1	English (en) Alexander horned sphere		311 616
2	Polish (pl) Rogata sfera Alexandera		44 022
3	Italian (it) Sfera di Alexander		38 943
4	Spanish (es) Esfera con cuernos de Alexander		32 150
5	Japanese (ja) アレクサンダーの角付き球面		26 434
6	Russian (ru) Рогатая сфера Александера		11 717
7	French (fr) Sphère cornue d'Alexander		11 295
8	Korean (ko) 알렉산더의 뿔 달린 구		7 165
9	Arabic (ar) كرة ألكسندر القرنية		2 829
10	Ukrainian (uk) Дика сфера		1 742

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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 "Alexander horned sphere" in June 2025

#	Language	Popularity award	Relative popularity
1	English (en) Alexander horned sphere		1 738
2	Japanese (ja) アレクサンダーの角付き球面		206
3	Russian (ru) Рогатая сфера Александера		173
4	Italian (it) Sfera di Alexander		134
5	Spanish (es) Esfera con cuernos de Alexander		78
6	French (fr) Sphère cornue d'Alexander		70
7	Korean (ko) 알렉산더의 뿔 달린 구		70
8	Polish (pl) Rogata sfera Alexandera		41
9	Arabic (ar) كرة ألكسندر القرنية		11
10	Ukrainian (uk) Дика сфера		6

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

Language versions of the article "Alexander horned sphere" with the highest Authors Interest (number of authors). Only registered Wikipedia users were taken into account.

#	Language	AI award	Relative AI
1	English (en) Alexander horned sphere		67
2	Russian (ru) Рогатая сфера Александера		24
3	Italian (it) Sfera di Alexander		20
4	French (fr) Sphère cornue d'Alexander		13
5	Spanish (es) Esfera con cuernos de Alexander		8
6	Polish (pl) Rogata sfera Alexandera		7
7	Catalan (ca) Esfera banyuda d'Alexander		4
8	Japanese (ja) アレクサンダーの角付き球面		4
9	Korean (ko) 알렉산더의 뿔 달린 구		4
10	Ukrainian (uk) Дика сфера		4

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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 "Alexander horned sphere" with the highest AI in June 2025

#	Language	AI award	Relative AI
1	Arabic (ar) كرة ألكسندر القرنية		0
2	Catalan (ca) Esfera banyuda d'Alexander		0
3	Greek (el) Κερασφόρος σφαίρα του Αλεξάντερ		0
4	English (en) Alexander horned sphere		0
5	Spanish (es) Esfera con cuernos de Alexander		0
6	French (fr) Sphère cornue d'Alexander		0
7	Italian (it) Sfera di Alexander		0
8	Japanese (ja) アレクサンダーの角付き球面		0
9	Korean (ko) 알렉산더의 뿔 달린 구		0
10	Polish (pl) Rogata sfera Alexandera		0

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

Language versions of the article "Alexander horned sphere" with the highest Citation Index (CI)

#	Language	CI award	Relative CI
1	Italian (it) Sfera di Alexander		141
2	English (en) Alexander horned sphere		30
3	Spanish (es) Esfera con cuernos de Alexander		9
4	Russian (ru) Рогатая сфера Александера		7
5	Catalan (ca) Esfera banyuda d'Alexander		6
6	French (fr) Sphère cornue d'Alexander		6
7	Japanese (ja) アレクサンダーの角付き球面		5
8	Arabic (ar) كرة ألكسندر القرنية		4
9	Polish (pl) Rogata sfera Alexandera		4
10	Korean (ko) 알렉산더의 뿔 달린 구		3

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#	Language	Value
ar	Arabic كرة ألكسندر القرنية
ca	Catalan Esfera banyuda d'Alexander
el	Greek Κερασφόρος σφαίρα του Αλεξάντερ
en	English Alexander horned sphere
es	Spanish Esfera con cuernos de Alexander
fr	French Sphère cornue d'Alexander
it	Italian Sfera di Alexander
ja	Japanese アレクサンダーの角付き球面
ko	Korean 알렉산더의 뿔 달린 구
pl	Polish Rogata sfera Alexandera
ru	Russian Рогатая сфера Александера
uk	Ukrainian Дика сфера

Best Rank

English: #181402 12.2019

Global: #223431 10.2013

Best Rank

English: #20257 11.2004

Global: #59943 11.2004

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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 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