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    If 'Hesperus is Hesperus' and 'Hesperus is Phosphorus' ar... — Carmelics
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    Challenges→Hyperintensional distinctions between necessarily equivalent propositions are impossible.

    If 'Hesperus is Hesperus' and 'Hesperus is Phosphorus' are necessarily equivalent yet differ in cognitive significance, propositional content must be finer-grained than necessity.

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    1 reason for
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    Reasons For

    1 perspective
    Reason for
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    • 1.Ancient astronomers could rationally reject 'Hesperus is Phosphorus' while accepting 'Hesperus is Hesperus', showing cognitive difference.
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    • 2.Necessary truths can differ in informativeness; necessity alone cannot explain why identity statements vary in epistemic value.
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    • 3.If propositional content tracked only necessary equivalence, Frege's puzzle about informative identities would lack adequate explanation.
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    Reasons Against

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    Reason against
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    • 1.Cognitive significance reflects epistemic access and belief psychology, not propositional content itself—these are separable phenomena.
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    • 2.Both statements have identical truth conditions and reference the same object; finer-grained content seems metaphysically unmotivated.
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    • 3.Necessity is the standard metric for propositional equivalence in modal semantics; expanding content-identity risks theoretical incoherence.
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    Connections

    2 topics

    Modality & Possibility1 linkedPhilosophy of Language1 linked

    Related

    Ancient astronomers could rationally reject 'Hesperus is Phosphorus' while accep...Both statements have identical truth conditions and reference the same object; f...Cognitive significance reflects epistemic access and belief psychology, not prop...Hyperintensional distinctions between necessarily equivalent propositions are im...
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    If propositional content tracked only necessary equivalence, Frege's puzzle abou...Necessary truths can differ in informativeness; necessity alone cannot explain w...Necessity is the standard metric for propositional equivalence in modal semantic...

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    2 (1 for, 1 against)
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