Explain briefly the following terms and concepts: a. extension b. fuzzy set c. prototype d. ostensive definition



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The extension principle extends crisp/defined domains to fuzzy ones.  A fuzzy set is different from a crisp one in that in a fuzzy set the elements have degrees of membership.  The protoype of a fuzzy set is the most central to the set.  The ostensive definition is using examples to indicate the defined term.

Essentially the difference between a crisp and fuzzy domain is that in a crisp domain one knows where the boundaries lay, as opposted to a fuzzy one in which the boundary is not exactly known.

Fuzzy logic is essentially how you can represent uncertainty mathematically.  Probabilty achieves the same goal.

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