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    Cognitive significance (the way a name presents its refer... — Carmelics
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    Supports→Frege's puzzle shows that 'Hesperus is Phosphorus' is informative in a way 'Hesperus is Hesperus' is not, which Russell's theory cannot explain without invoking distinct cognitive significance.

    Cognitive significance (the way a name presents its referent) must differ between names to account for rational agents accepting one but not the other.

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    Frege's puzzle shows that 'Hesperus is Phosphorus' is informative in a way 'Hesp...

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