Superrationality
（重定向自Superrational）
Superrationality (or renormalized rationality) is an alternative type of rational decision making different from the widely accepted game-theoretic one, since a superrational player playing against a superrational opponent in a prisoner's dilemma will cooperate while a rationally self-interested player will defect. This decision rule is not a mainstream model within game theory. The concept was created by Douglas Hofstadter, in his article, series, and book Metamagical Themas. He defined it in a recursive way: