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    Kripke's a posteriori necessities (e.g., water=H2O) const... — Carmelics
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    Challenges→Metaphysical reductions must always be backed by apriori entailments between the base-level claim and the target claim.

    Kripke's a posteriori necessities (e.g., water=H2O) constitute genuine metaphysical reductions without any corresponding apriori entailment.

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    1 reason for
    1 reason against

    Reasons For

    1 perspective
    Reason for
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    • 1.Water and H2O are genuinely identical in all possible worlds despite epistemic separability, making reduction metaphysically real.
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    • 2.A posteriori discovery of identities reveals underlying nature without requiring a priori entailment between concepts.
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    • 3.Scientific reduction succeeds precisely when empirical investigation reveals necessity without logical equivalence of terms.
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    Reasons Against

    1 perspective
    Reason against
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    • 1.If 'water' and 'H2O' lack a priori entailment, the identity may be contingent on this world's physical laws, not metaphysically necessary.
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    • 2.Conceptual non-equivalence suggests we've only discovered empirical correlation, not genuine metaphysical reduction of one thing to another.
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    • 3.A priori entailment may be required for reduction claims; without it, 'water=H2O' remains a contingent scientific regularity.
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    Truth & Knowledge1 linkedModality & Possibility1 linked

    Related

    A posteriori discovery of identities reveals underlying nature without requiring...A priori entailment may be required for reduction claims; without it, 'water=H2O...Conceptual non-equivalence suggests we've only discovered empirical correlation,...If 'water' and 'H2O' lack a priori entailment, the identity may be contingent on...
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    Metaphysical reductions must always be backed by apriori entailments between the...Scientific reduction succeeds precisely when empirical investigation reveals nec...Water and H2O are genuinely identical in all possible worlds despite epistemic s...

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    2 (1 for, 1 against)
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