Any supplementation of the psychological-continuity view that adds a 'no branching' clause is ad hoc, stipulating uniqueness rather than explaining why uniqueness matters metaphysically.
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(Referenced as a formal mereological axiom supporting the argument against co-constitution counterexamples)
A mereological principle (P.4) stating that if one entity has a proper part, there exists another part disjoint from it.
psychological-continuity view(Philosophy of personal identity)
The view that personal identity over time consists in psychological continuity — specifically, that any future being who is psychologically continuous with a given person must be identical to that person.