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WikiCards · Card list · Science cards · Category
Uncommon card · Science
Category, an Uncommon card
In mathematics, a category is a collection of "objects" that are linked by "arrows".
- Rarity
- Uncommon
- Domain
- Science
- ATK
- 67
- DEF
- 30
- Power
- 97
- Wikipedia reads a year
- 44,000
Power 97 (ATK + DEF): stronger than 40 % of WikiCards cards.
Category quiz: 3 questions
Three questions on the Category card, the way WikiCards duels ask them. Pick an answer, the facts are just below.
Find the missing word
A ______ example is the category of sets, whose objects are sets and whose arrows are functions.
Answer
simple. A simple example is the category of sets, whose objects are sets and whose arrows are functions. From the Category article on Wikipedia.
Which of these cards hits hardest (highest ATK)?
Answer
Category. Category 67 · Physical chemistry 60 · Blue hour 51 · Fordite 48 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 category has two basic properties: the ability to compose the arrows associatively and the existence of an identity arrow for each object.
- A simple example is the category of sets, whose objects are sets and whose arrows are functions.
- Category theory is a branch of mathematics that seeks to generalize all of mathematics in terms of categories, independent of what their objects and arrows represent.
Why it is Uncommon
Rarity in WikiCards follows a year of Wikipedia page views: the most read articles become Epic and Legendary cards. The Category 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 30: each hit it takes is cut by 12 %.
How to get Category
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 Category in the power ranking, all domains together.
- JanSportUncommon · Society · ATK 55 DEF 42
- Extreme value theoremUncommon · Science · ATK 66 DEF 31
- An Essay Concerning Human UnderstandingUncommon · Arts · ATK 61 DEF 36
- Mariinskyi PalaceUncommon · History · ATK 55 DEF 42
- Bekenstein boundUncommon · Science · ATK 61 DEF 36
- Desmond HaynesUncommon · Society · ATK 63 DEF 34
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, Category (revision), CC BY-SA 4.0. Photo : IkamusumeFan, CC BY-SA 4.0, Wikimedia Commons.
