WikiCards
Play on iPhone nowFree in Safari. Add it to your Home Screen.Play
WikiCards · Card list · Science cards · Error function
Rare card · Science
Error function, a Rare card
In mathematics, the error function, often denoted by e r f, is the function erf = 2 π ∫ 0 z e − t 2 d t. The integral here is a complex contour integral which is path-independent because exp is holomorphic on the whole complex plane C.
- Rarity
- Rare
- Domain
- Science
- ATK
- 77
- DEF
- 71
- Power
- 148
- Wikipedia reads a year
- 210,000
Power 148 (ATK + DEF): stronger than 75 % of WikiCards cards.
Error function quiz: 3 questions
Three questions on the Error function card, the way WikiCards duels ask them. Pick an answer, the facts are just below.
Find the missing word
In some older texts, the error function is defined without the ______ of 2 / π.
Answer
factor. In some older texts, the error function is defined without the factor of 2 / π. From the Error function article on Wikipedia.
Which of these cards hits hardest (highest ATK)?
Answer
Inverse trigonometric functions. Inverse trigonometric functions 82 · Error function 77 · Wilhelm Röntgen 70 · Atalanta 67 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 many applications, the function argument is a real number, in which case the function value is also real.
- In some older texts, the error function is defined without the factor of 2 / π.
- This nonelementary integral is a sigmoid function that occurs often in probability, statistics, and partial differential equations.
Why it is Rare
Rarity in WikiCards follows a year of Wikipedia page views: the most read articles become Epic and Legendary cards. The Error function article was read about 210,000 times in a year. ATK comes from the length of the article and DEF from its quality, so this card hits with 77 and blocks with 71: each hit it takes is cut by 28 %.
How to get Error function
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 Error function in the power ranking, all domains together.
- PorkRare · Society · ATK 78 DEF 70
- Baroque musicRare · Arts · ATK 75 DEF 73
- Betsy RossRare · Arts · ATK 71 DEF 77
- Wilhelm RöntgenRare · Science · ATK 70 DEF 78
- AtalantaUncommon · Arts · ATK 67 DEF 81
- Inverse trigonometric functionsRare · Science · ATK 82 DEF 66
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, Error function (revision), CC BY-SA 4.0. Photo : Inductiveload, Public domain, Wikimedia Commons.
