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WikiCards · Card list · Science cards · Stirling numbers of the second kind
Uncommon card · Science
Stirling numbers of the second kind, an Uncommon card
In mathematics, particularly in combinatorics, a Stirling number of the second kind is the number of ways to partition a set of n objects into k non-empty subsets and is denoted by S or { n k }.
- Rarity
- Uncommon
- Domain
- Science
- ATK
- 67
- DEF
- 47
- Power
- 114
- Wikipedia reads a year
- 44,000
Power 114 (ATK + DEF): stronger than 55 % of WikiCards cards.
Stirling numbers of the second kind quiz: 3 questions
Three questions on the Stirling numbers of the second kind card, the way WikiCards duels ask them. Pick an answer, the facts are just below.
Find the missing word
Stirling numbers of the second kind occur in combinatorics and the study of ______.
Answer
partitions. Stirling numbers of the second kind occur in combinatorics and the study of partitions. From the Stirling numbers of the second kind article on Wikipedia.
Which of these cards hits hardest (highest ATK)?
Answer
Foam. Foam 72 · Stirling numbers of the second kind 67 · Valeri Polyakov 62 · Griddle 55 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.
- Stirling numbers of the second kind occur in combinatorics and the study of partitions.
- They are named after James Stirling.
- The Stirling numbers of the first and second kind can be understood as inverses of one another when viewed as triangular matrices.
Why it is Uncommon
Rarity in WikiCards follows a year of Wikipedia page views: the most read articles become Epic and Legendary cards. The Stirling numbers of the second kind article was read about 44,000 times in a year. ATK comes from the length of the article and DEF from its quality, so this card hits with 67 and blocks with 47: each hit it takes is cut by 19 %.
How to get Stirling numbers of the second kind
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 Stirling numbers of the second kind in the power ranking, all domains together.
- FoamUncommon · Science · ATK 72 DEF 42
- Food additiveUncommon · Society · ATK 65 DEF 49
- ParkUncommon · Society · ATK 71 DEF 43
- GriddleUncommon · Science · ATK 55 DEF 59
- IchthyostegaUncommon · Nature · ATK 63 DEF 51
- Natalia MolchanovaUncommon · Society · ATK 60 DEF 54
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, Stirling numbers of the second kind (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.
