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    It is not the case that Omnes and Gell-Mann/Hartle's consistent histories frameworks show that multiple incompatible quasi-classical trajectory sets can satisfy decoherence conditions equally well, undermining any unique Newtonian approximation claim.

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    Reasons For

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    Reason for
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    • 1.Decoherence-satisfying histories still converge to overlapping macroscopic predictions; multiplicity at micro-level doesn't undermine effective Newtonian scope.
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    • 2.Coarse-graining freedom reflects practical measurement choices, not metaphysical equivalence—emergent classicality can still be uniquely grounded.
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    • 3.Gell-Mann/Hartle require consistency but don't claim all histories are equally predictive; pragmatic selection criteria restore classical uniqueness.
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    Reasons Against

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    Reason against
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    • 1.Decoherence depends on environmental interactions, which vary by system and observational context, naturally permitting multiple coarse-grainings.
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    • 2.Consistent histories explicitly shows that framework choice affects which propositions form logical algebras, proving multiplicity is structural, not epistemic.
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    • 3.If Newtonian mechanics were uniquely classical, interpretative differences in QM wouldn't produce equally empirically adequate trajectory reconstructions.
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