Many philosophers have suggested that a fruitful way to think about belief and uncertainty is through the framework of probability theory. The basic model for this way of thinking, often called “Bayesian,” is that an agent's degrees of belief can be represented by a probability function, which changes by incorporating new information as certain. The title of this book is a reference to the fact that it includes a new Bayesian framework that can deal with the loss of certainties, which can often happen either because of forgetting, or because of context sensitivity. (For instance, I am now certain that it is Friday, but in a few hours I won't be, because it will be false in the new context.)

However, while this new framework is important, and makes this book essential reading for people interested in the epistemology of these situations (whether Bayesian...

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