Parfit's reductionist account of personal identity undermines the notion that a numerically identical subject persists across a thousand years to 'own' and benefit from that history.

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Numerically identical(as used to describe whether two agents are the exact same person): Being literally the same thing, not just similar or alike—like how the person you are today is numerically identical to the person you were yesterday (one and the same individual).
Parfit: Derek Parfit was a highly influential British philosopher known for revolutionizing how we think about personal identity, morality, and what makes life worth living. He argued that our sense of being a continuous, unified "self" is partly an illusion, and that what really matters is the continuation of our thoughts and experiences, not some invisible thread connecting us through time. His ideas have shaped modern ethics and how philosophers approach questions about identity, responsibility, and how we should treat future generations.
Persists(metaphysics): Continues to exist or remain the same over time.
Reductionist account(Ockham's approach to explaining relations): An explanation that breaks something complex down into simpler parts, arguing that the complex thing is really just made up of those simpler components.

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