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WikiCards · Card list · Science cards · Hosoya index
Common card · Science
Hosoya index, a Common card
The Hosoya index, also known as the Z index, of a graph is the total number of matchings in it.
- Rarity
- Common
- Domain
- Science
- ATK
- 52
- DEF
- 25
- Power
- 77
- Wikipedia reads a year
- 2,000
Power 77 (ATK + DEF): stronger than 20 % of WikiCards cards.
Hosoya index quiz: 3 questions
Three questions on the Hosoya index card, the way WikiCards duels ask them. Pick an answer, the facts are just below.
Find the missing word
Equivalently, the Hosoya index is the number of non-empty ______ plus one.
Answer
matchings. Equivalently, the Hosoya index is the number of non-empty matchings plus one. From the Hosoya index article on Wikipedia.
Which of these cards hits hardest (highest ATK)?
Answer
Virtual queue. Virtual queue 58 · Hosoya index 52 · Lifan 530 45 · Superior medullary velum 40 ATK in WikiCards.
Which of these Wikipedia articles is read the most in a year?
Answer
Virtual queue. Virtual queue 3,700 · Superior medullary velum 2,900 · Hosoya index 2,000 · Vladimir Vukićević 1,300 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.
- The Hosoya index is always at least one, because the empty set of edges is counted as a matching for this purpose.
- Equivalently, the Hosoya index is the number of non-empty matchings plus one.
- The index is named after Haruo Hosoya.
Why it is Common
Rarity in WikiCards follows a year of Wikipedia page views: the most read articles become Epic and Legendary cards. The Hosoya index article was read about 2,000 times in a year. ATK comes from the length of the article and DEF from its quality, so this card hits with 52 and blocks with 25: each hit it takes is cut by 10 %.
How to get Hosoya index
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 Hosoya index in the power ranking, all domains together.
- Brampton CentreCommon · Society · ATK 52 DEF 25
- Cobh railway stationCommon · Society · ATK 48 DEF 29
- Han QiCommon · History · ATK 51 DEF 26
- Isaiah KnightCommon · Society · ATK 48 DEF 29
- Jean-Paul AdamCommon · History · ATK 53 DEF 24
- Zolton FerencyCommon · History · ATK 50 DEF 27
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, Hosoya index (revision), CC BY-SA 4.0. Photo : David Eppstein, CC0, Wikimedia Commons.
