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Why is fuzzy membership not the same as probability?

  • A.It concerns vagueness of the predicate rather than uncertainty of the fact
  • B.It uses different arithmetic to combine the numbers involved
  • C.Fuzzy values need not sum to one across the alternatives
  • D.Fuzzy logic applies only to control systems rather than reasoning

Answer: A

Whether a definite man of definite height counts as tall is a question about the word, not about the world, and no amount of evidence resolves it. A probability that he is tall would presuppose a sharp boundary and uncertainty about which side he falls. Arithmetic, normalisation and application area are consequences or incidental. Identifying which kind of imperfection in knowledge a problem exhibits is what selects the right formalism rather than the fashionable one.

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