Relations To Other Models
The well-founded semantics can be viewed as a three-valued version of the stable model semantics. Instead of only assigning propositions true or false, it also allows for a value representing ignorance.
For example, if we know that
Specimen A is a moth if specimen A does not fly during daylight.
but we do not know whether or not specimen A flies during the day, the well-founded semantics would assign the proposition ``specimen A is a moth`` the value bottom which is neither true nor false.
Read more about this topic: Well-founded Semantics
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