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WikiCards · Card list · Science cards · Binary relation
Uncommon card · Science
Binary relation, an Uncommon card
In mathematics, a binary relation associates some elements of one set called the domain with some elements of another set called the codomain.
- Rarity
- Uncommon
- Domain
- Science
- ATK
- 79
- DEF
- 76
- Power
- 155
- Wikipedia reads a year
- 47,000
Power 155 (ATK + DEF): stronger than 80 % of WikiCards cards.
Binary relation quiz: 3 questions
Three questions on the Binary relation card, the way WikiCards duels ask them. Pick an answer, the facts are just below.
Which of these cards hits hardest (highest ATK)?
Answer
Wilhelm Wundt. Wilhelm Wundt 88 · Binary relation 79 · Lepton 74 · Whirlpool Galaxy 71 ATK in WikiCards.
Which of these Wikipedia articles is read the most in a year?
Answer
Lepton. Lepton 110,000 · Refrigeration 69,000 · Binary relation 47,000 · Shopping center 33,000 Wikipedia reads over a year.
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.
- Precisely, a binary relation over sets X and Y is a set of ordered pairs, where x is an element of X and y is an element of Y. It encodes the common concept of relation: an element x is related to an element y if and only if the pair belongs to the set of ordered pairs that defines the binary relation.
- An example of a binary relation is the "divides" relation over the set of prime numbers P and the set of integers Z, in which each prime p is related to each integer z that is a multiple of p, but not to an integer that is not a multiple of p.
- In this relation, for instance, the prime number 2 is related to numbers such as − 4, 0, 6, 10, but not to 1 or 9, just as the prime number 3 is related to 0, 6, and 9, but not to 4 or 13.
Why it is Uncommon
Rarity in WikiCards follows a year of Wikipedia page views: the most read articles become Epic and Legendary cards. The Binary relation article was read about 47,000 times in a year. ATK comes from the length of the article and DEF from its quality, so this card hits with 79 and blocks with 76: each hit it takes is cut by 30 %.
How to get Binary relation
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 Binary relation in the power ranking, all domains together.
- Criminal Tribes ActUncommon · Arts · ATK 77 DEF 78
- Chinese calligraphyUncommon · Arts · ATK 79 DEF 76
- Agathis australisUncommon · Nature · ATK 75 DEF 80
- BiratnagarUncommon · Society · ATK 76 DEF 79
- Viking programUncommon · Science · ATK 75 DEF 80
- CalabarUncommon · Society · ATK 76 DEF 79
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, Binary relation (revision), CC BY-SA 4.0. Photo : MathThrowaway, CC BY-SA 4.0, Wikimedia Commons.
