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WikiCards · Card list · Science cards · Filter
Uncommon card · Science
Filter, an Uncommon card
In mathematics, a filter or order filter is a special subset of a partially ordered set, describing "large" or "eventual" elements.
- Rarity
- Uncommon
- Domain
- Science
- ATK
- 66
- DEF
- 37
- Power
- 103
- Wikipedia reads a year
- 18,000
Power 103 (ATK + DEF): stronger than 55 % of WikiCards cards.
Filter quiz: 3 questions
Three questions on the Filter card, the way WikiCards duels ask them. Pick an answer, the facts are just below.
Find the missing word
The ______ dual to a filter is an order ideal.
Answer
notion. The notion dual to a filter is an order ideal. From the Filter article on Wikipedia.
Which of these cards hits hardest (highest ATK)?
Answer
Voltage clamp. Voltage clamp 69 · Filter 66 · Cube root 60 · Ammonium acetate 53 ATK in WikiCards.
Which of these Wikipedia articles is read the most in a year?
Answer
Ammonium acetate. Ammonium acetate 30,000 · Filter 18,000 · Carl Wernicke 13,000 · Voltage clamp 9,900 Wikipedia reads over a year.
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.
- Filters appear in order and lattice theory, but also topology, whence they originate.
- The notion dual to a filter is an order ideal.
- Special cases of filters include ultrafilters, which are filters that cannot be enlarged, and describe nonconstructive techniques in mathematical logic.
Why it is Uncommon
Rarity in WikiCards follows a year of Wikipedia page views: the most read articles become Epic and Legendary cards. The Filter article was read about 18,000 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 37: each hit it takes is cut by 15 %.
How to get Filter
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 Filter in the power ranking, all domains together.
- Samuel BakerUncommon · History · ATK 66 DEF 37
- BooingUncommon · Society · ATK 67 DEF 36
- Cultural geographyUncommon · Science · ATK 58 DEF 45
- Hep-Hep riotsUncommon · Society · ATK 60 DEF 43
- Atacama RegionUncommon · Society · ATK 59 DEF 44
- William French SmithUncommon · History · ATK 64 DEF 39
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, Filter (revision), CC BY-SA 4.0. Photo : Jochen Burghardt, CC BY-SA 4.0, Wikimedia Commons.
