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God does not play dice with the Universe.
—Albert Einstein
Not only does God play dice, but sometimes he throws the dice where we can't see them.
—Stephen Hawking
Agents continually obtain new information and then must update their beliefs to take this new information into account. How this should be done obviously depends in part on how uncertainty is represented. Each of the methods of representing uncertainty considered in Chapter 2 has an associated method for updating. In this chapter, I consider issues raised by updating and examine how they play out in each of the representations of uncertainty.
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