The argument assumes the Law of the Excluded Middle applies to personal identityclaims, but intuitionist and paraconsistent logics deny this assumption for vague or process-based domains.
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(Used to challenge the modal inference from □¬p to ¬◇p in Fitch's knowability argument)
A logical system in which contradictions do not entail arbitrary conclusions, and in which a necessarily false statement may be both false and true at some world — making it both necessarily false and possible
personal identity(Philosophy of personal identity)
The relation of sameness holding between a person existing at one time and something existing at another time, analyzed here in terms of psychological continuity