Discussion
What is default logic?
Answer: B
Default logic adds rules of the form: if this holds and it is consistent to assume that, then conclude that, which lets birds fly by default while permitting exceptions. Multiple defaults may conflict, giving several extensions and requiring a choice. Truth values, axiom libraries and typicality restriction are different notions. A rule whose applicability depends on what cannot be proved, rather than on what can, is what makes such logics computationally awkward and expressively necessary.
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