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WikiCards · Card list · Science cards · Projection
Uncommon card · Science
Projection, an Uncommon card
In linear algebra and functional analysis, a projection is a linear transformation P from a vector space to itself such that P ∘ P = P.
- Rarity
- Uncommon
- Domain
- Science
- ATK
- 71
- DEF
- 54
- Power
- 125
- Wikipedia reads a year
- 73,000
Power 125 (ATK + DEF): stronger than 60 % of WikiCards cards.
Projection quiz: 3 questions
Three questions on the Projection card, the way WikiCards duels ask them. Pick an answer, the facts are just below.
Find the missing word
It leaves its image ______.
Answer
unchanged. It leaves its image unchanged. From the Projection article on Wikipedia.
Which of these cards hits hardest (highest ATK)?
Answer
Riemann integral. Riemann integral 74 · Projection 71 · Trafalgar-class submarine 66 · Empennage 62 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.
- That is, whenever P is applied twice to any vector, it gives the same result as if it were applied once.
- It leaves its image unchanged.
- This definition of "projection" formalizes and generalizes the idea of graphical projection.
Why it is Uncommon
Rarity in WikiCards follows a year of Wikipedia page views: the most read articles become Epic and Legendary cards. The Projection article was read about 73,000 times in a year. ATK comes from the length of the article and DEF from its quality, so this card hits with 71 and blocks with 54: each hit it takes is cut by 22 %.
How to get Projection
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 Projection in the power ranking, all domains together.
- StentUncommon · Science · ATK 70 DEF 55
- PesäpalloUncommon · Society · ATK 69 DEF 56
- Pocket watchUncommon · Society · ATK 70 DEF 55
- Al HarringtonUncommon · Society · ATK 69 DEF 56
- Louis ChevroletUncommon · History · ATK 63 DEF 62
- AmeriCorpsUncommon · History · ATK 71 DEF 54
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, Projection (revision), CC BY-SA 4.0. Photo : No machine-readable author provided. Jitse Niesen assumed (based on copyright claims)., Public domain, Wikimedia Commons.
