Decidability theory

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Decidability theory

Quality:

Recursive set - Set where an algorithm can take a number as an input and can decide whether the number belongs to the set. Article “Decidability theory” in Simple English Wikipedia has 3.5 points for quality (as of July 1, 2026).

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

Since the creation of article “Decidability theory”, its content was written by 7 registered users of Simple English Wikipedia and edited by 386 registered Wikipedia users in all languages.

The article is cited 27 times in Simple English Wikipedia and cited 2112 times in all languages.

The highest Authors Interest rank from 2001:

  • Local (Simple English): #1433 in July 2024
  • Global: #25521 in May 2004

The highest popularity rank from 2008:

  • Local (Simple English): #7968 in February 2009
  • Global: #152558 in February 2008

There are 22 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.

Languages with the highest quality

#LanguageQuality gradeQuality score
1German (de)
Entscheidbarkeit
32.7164
2English (en)
Computable set
23.9219
3Ukrainian (uk)
Обчисленна множина
13.8844
4Russian (ru)
Разрешимое множество
11.8742
5Italian (it)
Insieme ricorsivo
11.8198
6Chinese (zh)
递归集合
10.9037
7French (fr)
Ensemble récursif
8.6953
8Greek (el)
Αναδρομικό σύνολο
7.2642
9Persian (fa)
مجموعه بازگشتی
6.7606
10Portuguese (pt)
Conjunto recursivo
5.727
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 "Decidability theory" in all the time
#LanguagePopularity awardRelative popularity
1German (de)
Entscheidbarkeit
532 699
2English (en)
Computable set
342 371
3Russian (ru)
Разрешимое множество
44 476
4Italian (it)
Insieme ricorsivo
36 246
5French (fr)
Ensemble récursif
33 314
6Polish (pl)
Zbiór rekurencyjny
24 158
7Japanese (ja)
帰納的集合
22 463
8Chinese (zh)
递归集合
21 141
9Spanish (es)
Conjunto recursivo
18 322
10Portuguese (pt)
Conjunto recursivo
11 953
More...

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

Most popular in June 2026

The most popular language versions of the article "Decidability theory" in June 2026
#LanguagePopularity awardRelative popularity
1German (de)
Entscheidbarkeit
784
2English (en)
Computable set
561
3Chinese (zh)
递归集合
87
4French (fr)
Ensemble récursif
83
5Japanese (ja)
帰納的集合
73
6Russian (ru)
Разрешимое множество
56
7Polish (pl)
Zbiór rekurencyjny
51
8Simple English (simple)
Decidability theory
51
9Spanish (es)
Conjunto recursivo
44
10Italian (it)
Insieme ricorsivo
42
More...

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

The highest AI

Language versions of the article "Decidability theory" with the highest Authors Interest (number of authors). Only registered Wikipedia users were taken into account.
#LanguageAI awardRelative AI
1German (de)
Entscheidbarkeit
114
2English (en)
Computable set
63
3French (fr)
Ensemble récursif
48
4Italian (it)
Insieme ricorsivo
30
5Japanese (ja)
帰納的集合
16
6Hebrew (he)
קבוצה רקורסיבית
15
7Russian (ru)
Разрешимое множество
13
8Polish (pl)
Zbiór rekurencyjny
12
9Croatian (hr)
Neodlučivost
11
10Esperanto (eo)
Komputebla aro
10
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 2026

Language versions of the article "Decidability theory" with the highest AI in June 2026
#LanguageAI awardRelative AI
1German (de)
Entscheidbarkeit
2
2Hebrew (he)
קבוצה רקורסיבית
1
3Arabic (ar)
مجموعة قابلة للحساب
0
4Catalan (ca)
Conjunt recursiu
0
5Greek (el)
Αναδρομικό σύνολο
0
6English (en)
Computable set
0
7Esperanto (eo)
Komputebla aro
0
8Spanish (es)
Conjunto recursivo
0
9Persian (fa)
مجموعه بازگشتی
0
10French (fr)
Ensemble récursif
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 "Decidability theory" with the highest Citation Index (CI)
#LanguageCI awardRelative CI
1English (en)
Computable set
734
2Ukrainian (uk)
Обчисленна множина
243
3Portuguese (pt)
Conjunto recursivo
218
4German (de)
Entscheidbarkeit
212
5Chinese (zh)
递归集合
142
6French (fr)
Ensemble récursif
125
7Japanese (ja)
帰納的集合
107
8Russian (ru)
Разрешимое множество
78
9Persian (fa)
مجموعه بازگشتی
63
10Arabic (ar)
مجموعة قابلة للحساب
47
More...

Scores

Estimated value for Wikipedia:
Simple English:
Global:
Popularity in June 2026:
Simple English:
Global:
Popularity in all years:
Simple English:
Global:
Authors in June 2026:
Simple English:
Global:
Registered authors in all years:
Simple English:
Global:
Citations:
Simple English:
Global:

Quality measures

Interwikis

#LanguageValue
arArabic
مجموعة قابلة للحساب
caCatalan
Conjunt recursiu
deGerman
Entscheidbarkeit
elGreek
Αναδρομικό σύνολο
enEnglish
Computable set
eoEsperanto
Komputebla aro
esSpanish
Conjunto recursivo
faPersian
مجموعه بازگشتی
frFrench
Ensemble récursif
heHebrew
קבוצה רקורסיבית
hrCroatian
Neodlučivost
itItalian
Insieme ricorsivo
jaJapanese
帰納的集合
koKorean
재귀 집합
nlDutch
Recursieve verzameling
plPolish
Zbiór rekurencyjny
ptPortuguese
Conjunto recursivo
ruRussian
Разрешимое множество
simpleSimple English
Decidability theory
srSerbian
Рекурзиван скуп
ukUkrainian
Обчисленна множина
zhChinese
递归集合

Popularity rank trends

Best Rank Simple English:
#7968
02.2009
Global:
#152558
02.2008

AI rank trends

Best Rank Simple English:
#1433
07.2024
Global:
#25521
05.2004

Local popularity rank history

Local AI rank history

Languages comparison

Important global interconnections (July 2025 – June 2026)

Wikipedia readers most often find their way to information on Recursive set from Wikipedia articles about Recursively enumerable set, Hilberts problems, Formal system, Alan Turing and Undecidable problem. Whereas reading the article about Recursive set people most often go to Wikipedia articles on Recursively enumerable set, Computable function, Halting problem, Recursive language and Computability.

Cumulative results of quality and popularity of the Wikipedia article

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

News from 1 July 2026

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.

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 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