CHAPTER 13 EXPLANATION AND DIAGNOSIS

So far in this book we have concentrated on reasoning that is primarily deductive in nature: Given a KB representing some explicit beliefs about the world, we try to deduce some α, to determine if it is an implicit belief or perhaps to find a constant (or constants) c such that αxc is an implicit belief. This pattern shows up not only in ordinary logical reasoning, but also in description logics and procedural systems. In fact, a variant even shows up in probabilistic and default reasoning, where extra assumptions might be added to the KB, or degrees of belief might be considered.

In this chapter, we consider a completely different sort of reasoning task. Suppose we are given a KB and an α that we do not believe ...

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