Projection (set theory)

Projection - an operation in set theory that maps elements in a set to elements from another set. Article “Projection (set theory)” in English Wikipedia has 15.3 points for quality (as of July 1, 2025). The article contains 3 references and 2 sections.

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

Since the creation of article “Projection (set theory)”, its content was written by 17 registered users of English Wikipedia and edited by 32 registered Wikipedia users in all languages.

The article is cited 34 times in English Wikipedia and cited 169 times in all languages.

The highest Authors Interest rank from 2001:

• Local (English): #239578 in October 2011
• Global: #213850 in December 2014

The highest popularity rank from 2008:

• Local (English): #607084 in October 2011
• Global: #647236 in November 2019

There are 7 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	German (de) Projektion (Mengenlehre)		31.6626
2	Japanese (ja) 射影 (集合論)		17.948
3	Spanish (es) Proyección (teoría de conjuntos)		16.4188
4	Czech (cs) Projekce (teorie množin)		16.3706
5	English (en) Projection (set theory)		15.3483
6	Ukrainian (uk) Проекція (теорія множин)		2.1245
7	Greek (el) Προβολή (θεωρία συνόλων)		1.3454

More...

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

The most popular language versions of the article "Projection (set theory)" in all the time

#	Language	Popularity award	Relative popularity
1	English (en) Projection (set theory)		148 654
2	German (de) Projektion (Mengenlehre)		52 237
3	Japanese (ja) 射影 (集合論)		42 979
4	Spanish (es) Proyección (teoría de conjuntos)		577
5	Czech (cs) Projekce (teorie množin)		231
6	Ukrainian (uk) Проекція (теорія множин)		113
7	Greek (el) Προβολή (θεωρία συνόλων)		71

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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 "Projection (set theory)" in June 2025

#	Language	Popularity award	Relative popularity
1	English (en) Projection (set theory)		496
2	Japanese (ja) 射影 (集合論)		347
3	German (de) Projektion (Mengenlehre)		159
4	Spanish (es) Proyección (teoría de conjuntos)		12
5	Czech (cs) Projekce (teorie množin)		9
6	Ukrainian (uk) Проекція (теорія множин)		8
7	Greek (el) Προβολή (θεωρία συνόλων)		3

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

Language versions of the article "Projection (set theory)" with the highest Authors Interest (number of authors). Only registered Wikipedia users were taken into account.

#	Language	AI award	Relative AI
1	English (en) Projection (set theory)		17
2	German (de) Projektion (Mengenlehre)		6
3	Japanese (ja) 射影 (集合論)		3
4	Greek (el) Προβολή (θεωρία συνόλων)		2
5	Ukrainian (uk) Проекція (теорія множин)		2
6	Czech (cs) Projekce (teorie množin)		1
7	Spanish (es) Proyección (teoría de conjuntos)		1

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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 "Projection (set theory)" with the highest AI in June 2025

#	Language	AI award	Relative AI
1	Czech (cs) Projekce (teorie množin)		0
2	German (de) Projektion (Mengenlehre)		0
3	Greek (el) Προβολή (θεωρία συνόλων)		0
4	English (en) Projection (set theory)		0
5	Spanish (es) Proyección (teoría de conjuntos)		0
6	Japanese (ja) 射影 (集合論)		0
7	Ukrainian (uk) Проекція (теорія множин)		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 "Projection (set theory)" with the highest Citation Index (CI)

#	Language	CI award	Relative CI
1	Japanese (ja) 射影 (集合論)		78
2	German (de) Projektion (Mengenlehre)		50
3	English (en) Projection (set theory)		34
4	Spanish (es) Proyección (teoría de conjuntos)		4
5	Czech (cs) Projekce (teorie množin)		2
6	Ukrainian (uk) Проекція (теорія множин)		1
7	Greek (el) Προβολή (θεωρία συνόλων)		0

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#	Language	Value
cs	Czech Projekce (teorie množin)
de	German Projektion (Mengenlehre)
el	Greek Προβολή (θεωρία συνόλων)
en	English Projection (set theory)
es	Spanish Proyección (teoría de conjuntos)
ja	Japanese 射影 (集合論)
uk	Ukrainian Проекція (теорія множин)

Best Rank

English: #607084 10.2011

Global: #647236 11.2019

Best Rank

English: #239578 10.2011

Global: #213850 12.2014

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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