Nonmonotonic consequence relations grounded in preferred models cannot distinguish epistemic from metaphysical sources of revisability, collapsing a distinction Kripke's work makes mandatory.
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A logical system where adding new information can make previously valid conclusions become invalid—like how learning a new fact might change your mind about something you thought was true.
Revisability(something that both Popper and Haslanger think is necessary for good thinking)
The ability to change, update, or fix something when you get new information or realize it's not working.
metaphysical(Ayer's Logical Positivist usage)
Language that purports to refer beyond the physical world and lacks empirical consequences, which Ayer classifies as not literally significant
Models of the nonmonotonic logic in which the caused propositions coincide exactly with the true propositions and this is the only possibility consistent with the extensional part of the model