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It is not the case that Therefore, mereological coincidence of all exact locations holds only under a tenseless, four-dimensionalist ontology, not universally.
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Reasons For
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1.
Mereological coincidence presents equally under three-dimensionalism if objects differ in non-spatial properties or modal profiles regardless of tenselessness.
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2.
The claim conflates metaphysical commitment to tenselessness with solving coincidence—but the real work is done by finer individuation conditions, not temporal orientation.
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3.
Four-dimensionalism inherits coincidence problems at each temporal slice, suggesting the framework doesn't fundamentally resolve the issue.
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Reasons Against
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Reason against
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1.
Four-dimensionalism treats objects as extended through time like regions of spacetime, making mereological coincidence natural across temporal slices.
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2.
Tenseless ontology eliminates the problem of change: parts don't literally gain/lose identity over time, only occupy different temporal locations.
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3.
Three-dimensionalism's presentism struggles to explain how coinciding objects remain distinct when their present parts are identical.
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