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WikiCards · Card list · Science cards · Bell number
Uncommon card · Science
Bell number, an Uncommon card
In combinatorial mathematics, the Bell numbers count the possible partitions of a set.
- Rarity
- Uncommon
- Domain
- Science
- ATK
- 70
- DEF
- 57
- Power
- 127
- Wikipedia reads a year
- 39,000
Power 127 (ATK + DEF): stronger than 60 % of WikiCards cards.
Bell number quiz: 3 questions
Three questions on the Bell number card, the way WikiCards duels ask them. Pick an answer, the facts are just below.
Find the missing word
The Bell numbers are denoted B n, where n is an ______ greater than or equal to zero.
Answer
integer. The Bell numbers are denoted B n, where n is an integer greater than or equal to zero. From the Bell number article on Wikipedia.
In which decade?
In an example of Stigler's law of eponymy, they are named after Eric Temple Bell, who wrote about them in the ____s.
Answer
1930s. In an example of Stigler's law of eponymy, they are named after Eric Temple Bell, who wrote about them in the 1930s. From the Bell number article on Wikipedia.
Which of these cards hits hardest (highest ATK)?
Answer
Aktobe. Aktobe 78 · Algebraic variety 74 · Bell number 70 · David Duffield 65 ATK in WikiCards.
In a duel, each round asks a question like these about the opposing card, with 15 seconds to answer.
The facts on the card
The card carries these facts from its Wikipedia article.
- These numbers have been studied by mathematicians since the 19th century, and their roots go back to medieval Japan.
- In an example of Stigler's law of eponymy, they are named after Eric Temple Bell, who wrote about them in the 1930s.
- The Bell numbers are denoted B n, where n is an integer greater than or equal to zero.
Why it is Uncommon
Rarity in WikiCards follows a year of Wikipedia page views: the most read articles become Epic and Legendary cards. The Bell number article was read about 39,000 times in a year. ATK comes from the length of the article and DEF from its quality, so this card hits with 70 and blocks with 57: each hit it takes is cut by 23 %.
How to get Bell number
Open packs. Each pack holds five cards drawn from real Wikipedia articles, the rarest last, and the fifth card is always Rare or better. The odds are shown in the game. A free pack arrives every hour and two can wait, and the Coins you win in duels buy more packs.
More Science cards
Cards close in power
The cards just above and just below Bell number in the power ranking, all domains together.
- AktobeUncommon · History · ATK 78 DEF 49
- Abul FazlUncommon · History · ATK 67 DEF 60
- PlasticityUncommon · Science · ATK 69 DEF 58
- PlastidUncommon · Nature · ATK 69 DEF 58
- AdipocyteUncommon · Science · ATK 65 DEF 62
- Eastern VisayasUncommon · Society · ATK 69 DEF 58
Card lists
- Wikipedia quizNew questions every day
- All cards from A to ZEvery card, by name
- Science cards
- Legendary cards
- Tier listS and A tiers by power (ATK + DEF)
Credits
Text : Wikipedia, Bell number (revision), CC BY-SA 4.0. Photo : Watchduck You can name the author as "T. Piesk", "Tilman Piesk" or "Watchduck"., CC BY 3.0, Wikimedia Commons.
