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by jacques_chester 2298 days ago
The truth value being 0.8 can be mapped to one or more fuzzy sets. That's what you're typically doing. Saying "I don't know" is still possible, because you can define a fuzzy set representing "I don't know". But now you can say how strongly you don't know.

An overlapping alternative is Dempster-Shafer evidence theory, which has "belief functions" and rules on how to combine them.