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WikiCards · Card list · Science cards · 3-sphere
Uncommon card · Science
3-sphere, an Uncommon card
In mathematics, a hypersphere or 3-sphere is a 4-dimensional analogue of a sphere, and is the 3-dimensional n-sphere.
- Rarity
- Uncommon
- Domain
- Science
- ATK
- 69
- DEF
- 44
- Power
- 113
- Wikipedia reads a year
- 52,000
Power 113 (ATK + DEF): stronger than 50 % of WikiCards cards.
3-sphere quiz: 3 questions
Three questions on the 3-sphere card, the way WikiCards duels ask them. Pick an answer, the facts are just below.
Find the missing word
The ______ of a 3-sphere is a 4-ball.
Answer
interior. The interior of a 3-sphere is a 4-ball. From the 3-sphere article on Wikipedia.
Which of these cards hits hardest (highest ATK)?
Answer
3-sphere. 3-sphere 69 · Geotagging 65 · Johann Bernoulli 62 · Cardboard 56 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.
- In 4-dimensional Euclidean space, it is the set of points equidistant from a fixed central point.
- The interior of a 3-sphere is a 4-ball.
- It is called a 3-sphere because topologically, the surface itself is 3-dimensional, even though it is curved into the 4th dimension.
Why it is Uncommon
Rarity in WikiCards follows a year of Wikipedia page views: the most read articles become Epic and Legendary cards. The 3-sphere article was read about 52,000 times in a year. ATK comes from the length of the article and DEF from its quality, so this card hits with 69 and blocks with 44: each hit it takes is cut by 18 %.
How to get 3-sphere
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 3-sphere in the power ranking, all domains together.
- High-pressure areaUncommon · Society · ATK 64 DEF 49
- AgamidaeUncommon · Nature · ATK 64 DEF 49
- OmdurmanUncommon · Nature · ATK 60 DEF 53
- 2028 Summer ParalympicsUncommon · Society · ATK 71 DEF 42
- CupressusUncommon · Nature · ATK 65 DEF 48
- GeotaggingUncommon · Science · ATK 65 DEF 48
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, 3-sphere (revision), CC BY-SA 4.0. Photo : derivative work: Pbroks13 ( talk ) Hypersphere_coord.gif : Claudio Rocchini, CC BY 3.0, Wikimedia Commons.
