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WikiCards · Card list · Science cards · Riemann sphere
Uncommon card · Science
Riemann sphere, an Uncommon card
In mathematics, the Riemann sphere, named after Bernhard Riemann, is a model of the extended complex plane: the complex plane plus one point at infinity.
- Rarity
- Uncommon
- Domain
- Science
- ATK
- 66
- DEF
- 40
- Power
- 106
- Wikipedia reads a year
- 58,000
Power 106 (ATK + DEF): stronger than 45 % of WikiCards cards.
Riemann sphere quiz: 3 questions
Three questions on the Riemann sphere card, the way WikiCards duels ask them. Pick an answer, the facts are just below.
Find the missing word
This ______ plane represents the extended complex numbers, that is, the complex numbers plus a value ∞ for infinity.
Answer
extended. This extended plane represents the extended complex numbers, that is, the complex numbers plus a value ∞ for infinity. From the Riemann sphere article on Wikipedia.
Which of these cards hits hardest (highest ATK)?
Answer
Tommy Burns. Tommy Burns 72 · Riemann sphere 66 · Hamiltonian path 63 · Latin dance 59 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.
- This extended plane represents the extended complex numbers, that is, the complex numbers plus a value ∞ for infinity.
- With the Riemann model, the point ∞ is near to very large numbers, just as the point 0 is near to very small numbers.
- The extended complex numbers are useful in complex analysis because they allow for division by zero in some circumstances, in a way that makes expressions such as 1 / 0 = ∞ well-behaved.
Why it is Uncommon
Rarity in WikiCards follows a year of Wikipedia page views: the most read articles become Epic and Legendary cards. The Riemann sphere article was read about 58,000 times in a year. ATK comes from the length of the article and DEF from its quality, so this card hits with 66 and blocks with 40: each hit it takes is cut by 16 %.
How to get Riemann 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 Riemann sphere in the power ranking, all domains together.
- CongruenceUncommon · Science · ATK 63 DEF 43
- Seth LugoUncommon · Society · ATK 63 DEF 43
- Tommy BurnsUncommon · Society · ATK 72 DEF 34
- Extended familyUncommon · Society · ATK 65 DEF 41
- Jaan TallinnUncommon · Science · ATK 64 DEF 42
- MaximalismUncommon · Arts · ATK 64 DEF 42
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, Riemann sphere (revision), CC BY-SA 4.0. Photo : GKFX talk , de:User:Bjoern_klipp, CC BY-SA 3.0, Wikimedia Commons.
