Default Reasoning
Commonsense reasoning requires default reasoning. As we engage in commonsense reasoning, we make certain assumptions so that we can proceed. If we later gain more information, then we may have to revise those assumptions. For example, if we are told that Nathan went to sleep, we might assume that he went to sleep in his home. If we are told that he cooked breakfast, we might imagine him in his kitchen. If we later learn that he was actually at a hotel, our understanding of these events will have to be modified.
We have so far considered two special cases of default reasoning: assuming that unexpected events do not occur and assuming that events do not have unexpected effects. In this chapter, we consider default ...
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