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Re: Re fuzzy logic



Fuzzy values behave a little differently than probabilibities, though there
are many similarities. For example, given that A has fuzzy logic value .4
and B has fuzzy logic value .6, A&B has the value min(.4,.6)=.4. But if
A has probability .4 and B has probability .6, then A&B can have any
probability between 0 and .4. Fuzzy logic is *truth functional* which
means that knowing the truth values of the components you can compute the
truth value of the composite. This does not hold for probabilities in the
same way.

Richard Grandy
Philosophy & Cognitive Sciences
Rice University


At 9:10 PM -0400 1/18/98, LUDWIK KOWALSKI wrote:
Thanks to those who helped to clarify the term. It seems that we again have
a situation in which the common meaning of the phrase (fuzzy logic is bad
logic) is confused with its meanings in mathematics. Looks like a better
term, something like probabilistic logic, would be more appropriate.

Using the Fermi method to solve problems can probably be described as an
application of quazi-fuzzy logic.

Ludwik Kowalski
What is fuzzy logic?
What my wife uses in "discussions".
And some students too.