Re: Adding more evidence


Subject: Re: Adding more evidence
From: Kami ROUSSEAU (kami@interlinx.qc.ca)
Date: Wed Jan 26 2000 - 23:28:46 MET


For those of you still following this discussion, here is a pointer the
original watermelon example.

The Paradoxical Success of Fuzzy Logic.
Charles Elkan
University of California, San Diego
http://www-cse.ucsd.edu/users/elkan/

watermelon(x) IIF redinside(x) AND greenoutside(x).
For some melon m, suppose that t(redinside(m)) = 0.5 and
t(greenoutside(m)) = 0.8, meaning that the evidence that m is red internally
has
strength 0.5 and m is green externally with strength of evidence 0.8. Are
the rules of
fuzzy logic adequate for reasoning about this particular type of
uncertainty? They
say that the strength of evidence that m is a watermelon is t(watermelon(m))
=
min(0.5, 0.8) = 0.5. However, implicit background knowledge in this context
says that being red inside and green outside are mutually reinforcing pieces
of
evidence towards being a watermelon, and m is a watermelon with strength of
evidence over 0.5.

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