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What is fuzzy logic concerned with?

  • A.Degrees of belief in propositions that are true or false
  • B.Probabilities that are themselves uncertain quantities
  • C.Reasoning with rules whose conclusions may be retracted
  • D.Degrees of membership in vaguely defined categories

Answer: D

Fuzzy logic addresses vagueness, where a man of a certain height is partly tall, rather than uncertainty about a definite fact. That is a different phenomenon from probability, and confusing the two produces a great deal of fruitless argument. Belief, second order probability and defeasibility are separate notions. Distinguishing vagueness in the predicate from uncertainty about the world is the first step in deciding which formalism a problem requires.

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