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WikiCards · Card list · Science cards · Bijection, injection and surjection
Uncommon card · Science
Bijection, injection and surjection, an Uncommon card
In mathematics, injections, surjections, and bijections are classes of functions distinguished by the manner in which arguments and images are related or mapped to each other.
- Rarity
- Uncommon
- Domain
- Science
- ATK
- 61
- DEF
- 61
- Power
- 122
- Wikipedia reads a year
- 43,000
Power 122 (ATK + DEF): stronger than 60 % of WikiCards cards.
Bijection, injection and surjection quiz: 3 questions
Three questions on the Bijection, injection and surjection card, the way WikiCards duels ask them. Pick an answer, the facts are just below.
Find the missing word
An ______ function is also called an injection.
Answer
injective. An injective function is also called an injection. From the Bijection, injection and surjection article on Wikipedia.
Which of these cards hits hardest (highest ATK)?
Answer
Inverse hyperbolic functions. Inverse hyperbolic functions 68 · Carding 65 · Bijection, injection and surjection 61 · Bichon 54 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.
- A function maps elements from its domain to elements in its codomain.
- Given a function f : X → Y : The function is injective, or one-to-one, if each element of the codomain is mapped to by at most one element of the domain, or equivalently, if distinct elements of the domain map to distinct elements in the codomain.
- An injective function is also called an injection.
Why it is Uncommon
Rarity in WikiCards follows a year of Wikipedia page views: the most read articles become Epic and Legendary cards. The Bijection, injection and surjection article was read about 43,000 times in a year. ATK comes from the length of the article and DEF from its quality, so this card hits with 61 and blocks with 61: each hit it takes is cut by 24 %.
How to get Bijection, injection and surjection
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 Bijection, injection and surjection in the power ranking, all domains together.
- ColoaneUncommon · Nature · ATK 66 DEF 56
- Wickes-class destroyerUncommon · History · ATK 67 DEF 55
- Pat BarkerUncommon · Arts · ATK 66 DEF 56
- CardingUncommon · Science · ATK 65 DEF 57
- Dutch CeylonUncommon · History · ATK 70 DEF 52
- Laser cuttingUncommon · Science · ATK 69 DEF 53
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, Bijection, injection and surjection (revision), CC BY-SA 4.0. Photo : Schapel, Public domain, Wikimedia Commons.
