I propose that also a third type of knowledge representation based on conceptual models should be studied. In particular, I will discuss conceptual models based on geometrical and topological notions and show their relevance for concept revision and for non-monotonic aspects of concepts. I will argue that concpetual models of knowledge can be seen as a bridge between symbolic and connectionist representations. The three kinds of knowledge representation models should thus not be seen as competitors, but rather as complementary models suitable for different modelling tasks.
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