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Rationality is the characteristic of thinking and acting optimally. An agent is rational if it wields its intelligence in such a way as to maximize the convergence between its beliefs and reality; and acts on these beliefs in such a manner as to maximize its chances of achieving whatever goals it has. For humans, this means mitigating (as much as possible) the influence of cognitive biases, reflecting and acting on one's desires, and combating Akrasia.

Epistemic rationality

Epistemic rationality is that part of rationality which involves achieving accurate beliefs about the world. It involves updating on receiving new evidence, mitigating cognitive biases, and examining why you believe what you believe.

Instrumental rationality

In a sense, epistimic rationality is a special case of of instrumental rationality, for instrumental rationality is that part of rationality which is concerned with achieving goals; and an accurate picture of reality is instrumentally necessary for the achievement of most goals. More specifically, instrumental rationality is the art of choosing and *implementing* actions that steer the future toward outcomes ranked higher in one's preferences. LW sometimes shortens this to "winning."

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