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How did the field respond to the defeasibility of real knowledge?

  • A.By restricting attention to domains with certain knowledge
  • B.By adding more inference rules to classical logic
  • C.By developing probabilistic and non-monotonic formalisms
  • D.By abandoning knowledge representation altogether

Answer: C

Bayesian networks and the non-monotonic logics were both developed to handle knowledge that is uncertain or defeasible, and the probabilistic branch has proved by far the more influential. Restriction to certain domains would exclude almost everything interesting, and adding rules to a monotonic logic cannot make it non-monotonic. Two distinct responses to the same limitation, one of which prospered, is a piece of the field's history worth knowing when reading older literature.

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