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    If identity is a relation, then 'Hesperus is Phosphorus' ... — Carmelics
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    Challenges→Frege's puzzle about identity shows that 'Hesperus is Phosphorus' and 'Hesperus is Hesperus' differ in cognitive significance despite sharing the same worldly referents.

    If identity is a relation, then 'Hesperus is Phosphorus' and 'Hesperus is Hesperus' have identical truth-conditions and semantic content by transitivity.

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    Frege's puzzle about identity shows that 'Hesperus is Phosphorus' and 'Hesperus ...

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    Frege's puzzle about identity shows that 'Hesperus is Phosphorus' and 'Hesperus ...

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