Chapter 14 Agents almost never have access to the whole truth about their environment. The right thing to do, the rational decision, therefore, depends on both the relative importance of various goals and the likelihood that, and degree to which, they will be achieved. Probability provides a way of summarizing the uncertainty that comes from our laziness and ignorance. Probability theory makes the same ontological commitment as logic, namely, that facts either do or do not hold in the world. Degree of truth, as opposed to degree of belief, is the subject of fuzzy logic. Prior or unconditional probability; after the evidence is obtained, we talk about posterior or conditional probability. An agent is rational if and only if it chooses the action that yields the highest expected utility, averaged over all the possible outcomes of the action If Agent 1 expresses a set of degrees of belief that violate the axioms of probability theory then there is a betting strategy for Agent 2...