Mathematical proof, an Uncommon card

The card carries these facts from its Wikipedia article.

• The argument may use other previously established statements, such as theorems, but every proof can, in principle, be constructed using only certain basic or original assumptions known as axioms, along with the accepted rules of inference.
• Proofs are examples of exhaustive deductive reasoning that establish logical certainty, to be distinguished from empirical arguments or non-exhaustive inductive reasoning that establish "reasonable expectation".
• Presenting many cases in which the statement holds is not enough for a proof, which must demonstrate that the statement is true in all possible cases.

Rarity in WikiCards follows a year of Wikipedia page views: the most read articles become Epic and Legendary cards. The Mathematical proof article was read about 91,000 times in a year. ATK comes from the length of the article and DEF from its quality, so this card hits with 72 and blocks with 51: each hit it takes is cut by 20 %.

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.

The cards just above and just below Mathematical proof in the power ranking, all domains together.