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    A-properties typically constitute what entities are funda... — Carmelics
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    Challenges→If the domains of worlds vary, a B-preserving isomorphism can exist between worlds that differ in which A-properties are instantiated, undermining P3's identification of the two conditions.

    A-properties typically constitute what entities are fundamental to a world; changing which A-properties are instantiated changes world identity itself, not just isomorphism conditions.

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    Key Terms

    A-properties(McTaggart's argument against the A-series)
    The properties of being present, being past, and being future, which are mutually incompatible
    Isomorphism conditions(metaphysics)
    The rules or standards for when two things have the same structure or pattern, even if they're not identical—like how two maps can show the same city layout differently but still represent the same thing.
    World identity(metaphysics)
    What makes a possible world uniquely itself—the fundamental features that would have to be different for it to be a completely different world rather than the same world.
    instantiated(as used in metaphysics and logic)
    Made real or brought into existence as an actual example; like when a concept becomes a real thing you can observe.

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    If the domains of worlds vary, a B-preserving isomorphism can exist between worl...

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