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    The four-dimensionalist framework of Lewis and Sider allo... — Carmelics
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    Challenges→Adam (the original embryo) does not survive twinning as either or both twins.

    The four-dimensionalist framework of Lewis and Sider allows that Adam is a temporal stage shared by two distinct person-worms that overlap at the pre-twinning segment.

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    Reasons For

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    Reason for
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    • 1.Four-dimensionalism treats persons as extended entities in time, making temporal overlap of distinct worms at shared stages coherent and metaphysically legitimate.
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    • 2.Pre-twinning identity conditions can be preserved while post-twinning divergence creates new person-worms, elegantly handling fission cases without denying continuity.
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    • 3.This framework avoids the counterintuitive requirement that a person must be wholly distinct at every temporal slice, allowing stage-sharing between numerically different continuants.
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    Reasons Against

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    • 1.If two person-worms genuinely differ as distinct entities, sharing an identical stage seems to violate the distinctness relation—identical parts entail identity.
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    • 2.The notion of 'overlapping' worms at a stage requires clarification: either stages are mereological parts (making overlap impossible) or the framework is obscure about composition.
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    • 3.This solution may merely relabel the fission problem rather than solve it—saying 'two worms share Adam' doesn't explain which worm Adam is before divergence.
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    Personal Identity1 linkedBioethics1 linked

    Related

    Adam (the original embryo) does not survive twinning as either or both twins.Four-dimensionalism treats persons as extended entities in time, making temporal...If two person-worms genuinely differ as distinct entities, sharing an identical ...Pre-twinning identity conditions can be preserved while post-twinning divergence...
    +3 moreShow less
    The notion of 'overlapping' worms at a stage requires clarification: either stag...This framework avoids the counterintuitive requirement that a person must be who...This solution may merely relabel the fission problem rather than solve it—saying...

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