Range of a function, an Uncommon card

In mathematics, the range of a function may refer to either of two closely related concepts: the codomain of the function, or the image of the function.
From the Wikipedia article

Rarity: Uncommon
Domain: Science
ATK: 50
DEF: 21
Power: 71
Wikipedia reads a year: 18,000

Power 71 (ATK + DEF): stronger than 15 % of WikiCards cards.

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The facts on the card

The card carries these facts from its Wikipedia article.

In some cases the codomain and the image of a function are the same set, such a function is called surjective or onto.
For any non-surjective function f : X → Y, the codomain Y and the image Y ~ are different, however, a new function can be defined with the original function's image as its codomain, f ~ : X → Y ~ where f ~ = f. This new function is surjective.

Why it is Uncommon

Rarity in WikiCards follows a year of Wikipedia page views: the most read articles become Epic and Legendary cards. The Range of a function 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 50 and blocks with 21: each hit it takes is cut by 8 %.

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Credits

Text : Wikipedia, Range of a function (revision), CC BY-SA 4.0. Photo : en:User:Nguyen Huu Phuoc ([[:en:User talk:Phuoc Nguyen]talk]]), Public domain, Wikimedia Commons.