Category theory

Quality:

Category theory - branch of mathematics studying categories, functors, and natural transformations. Article “Category theory” in Simple English Wikipedia has 3.6 points for quality (as of July 1, 2026). The article also contains templates indicating quality issues, therefore its score was reduced by 0.19 points.

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

Since the creation of article “Category theory”, its content was written by 9 registered users of Simple English Wikipedia and edited by 1291 registered Wikipedia users in all languages.

The article is cited 42 times in Simple English Wikipedia and cited 7013 times in all languages.

The highest Authors Interest rank from 2001:

• Local (Simple English): #1413 in December 2010
• Global: #163 in April 2002

The highest popularity rank from 2008:

• Local (Simple English): #6169 in May 2011
• Global: #12754 in February 2015

There are 43 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, 2026 (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	Finnish (fi) Kategoriateoria		76.8824
2	Polish (pl) Teoria kategorii		57.8065
3	Chinese (zh) 范畴论		48.0124
4	Portuguese (pt) Teoria das categorias		44.8661
5	French (fr) Théorie des catégories		42.9072
6	English (en) Category theory		37.5197
7	Greek (el) Θεωρία κατηγοριών		35.6796
8	Ukrainian (uk) Теорія категорій		34.7872
9	Spanish (es) Teoría de categorías		31.016
10	Russian (ru) Теория категорий		28.1412

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

#	Language	Popularity award	Relative popularity
1	English (en) Category theory		3 215 270
2	Russian (ru) Теория категорий		629 992
3	Japanese (ja) 圏論		572 777
4	German (de) Kategorientheorie		357 033
5	French (fr) Théorie des catégories		333 056
6	Spanish (es) Teoría de categorías		314 127
7	Chinese (zh) 范畴论		212 490
8	Italian (it) Teoria delle categorie		139 428
9	Polish (pl) Teoria kategorii		109 277
10	Portuguese (pt) Teoria das categorias		103 665

The following table shows the language versions of the article with the highest popularity in the last month.

#	Language	Popularity award	Relative popularity
1	English (en) Category theory		13 040
2	Japanese (ja) 圏論		2 889
3	Russian (ru) Теория категорий		2 106
4	French (fr) Théorie des catégories		1 424
5	Chinese (zh) 范畴论		1 115
6	German (de) Kategorientheorie		978
7	Spanish (es) Teoría de categorías		578
8	Italian (it) Teoria delle categorie		401
9	Polish (pl) Teoria kategorii		399
10	Portuguese (pt) Teoria das categorias		244

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

#	Language	AI award	Relative AI
1	English (en) Category theory		317
2	French (fr) Théorie des catégories		131
3	German (de) Kategorientheorie		114
4	Russian (ru) Теория категорий		83
5	Italian (it) Teoria delle categorie		61
6	Spanish (es) Teoría de categorías		46
7	Japanese (ja) 圏論		46
8	Chinese (zh) 范畴论		45
9	Polish (pl) Teoria kategorii		41
10	Hebrew (he) תורת הקטגוריות		30

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

#	Language	AI award	Relative AI
1	Arabic (ar) نظرية الفئات		1
2	Catalan (ca) Teoria de categories		1
3	English (en) Category theory		1
4	Esperanto (eo) Teorio de kategorioj		1
5	Basque (eu) Kategorien teoria		1
6	Italian (it) Teoria delle categorie		1
7	Polish (pl) Teoria kategorii		1
8	Portuguese (pt) Teoria das categorias		1
9	Bulgarian (bg) Теория на категориите		0
10	Czech (cs) Teorie kategorií		0

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

On 1 July 2026 in multilingual Wikipedia, Internet users most often read articles on the following topics: 2026 FIFA World Cup, Kylian Mbappé, Erling Haaland, Democratic Republic of the Congo, FIFA World Cup, Harry Kane, Romelu Lukaku, Senegal, Michael Olise, Sadio Mané.

In Simple English Wikipedia the most popular articles on that day were: List of European countries, Black, List of sex positions, 2026 Iran war, Suresh Raina, Politics of Germany, Academy Award for Best Director, 2020, DYSS-TV, 2022.

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 50 million Wikipedia articles in 55 languages. Quality scores of articles are based on Wikipedia dumps from July, 2026. When calculating current popularity and AI of articles data from June 2026 was taken into account. For historical values of popularity and AI WikiRank used data from 2001 to 2026... More information