PROCEEDINGS IPMU '08
On degrees of truth, partial ignorance and contradiction
Didier Dubois
In many works dealing with knowledge
representation, there is a temptation
to extend the truth-set with values
expressing ignorance and contradiction.
This is the case with partial
logic and Belnap bilattice logic.
This is also true in interval-valued extensions
of fuzzy sets. This paper
shows that ignorance and contradiction
cannot be viewed as additional
truth-values nor processed in a truthfunctional
manner.
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