Sentences (17) and (18) do not differ in meaning — Carmelics

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Sentences (17) and (18) do not differ in meaning

Philosophy of Language Truth & Knowledge

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1 reason for

2 reasons against

Reasons For

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Reason for

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1.The Millian-Russellian holds that the content of a proper name is the object to which that name refers
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2.'Clark Kent' and 'Superman' are proper names that refer to the same object
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3.Sentences (17) and (18) differ only by substitution of 'Clark Kent' for 'Superman'
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Reasons Against

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Reason against 1 of 2

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1.Proper names in belief contexts contribute their mode of presentation (Sinn), not merely their referent, to propositional content (Frege 1892).
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2.'Clark Kent' and 'Superman' present the same individual under distinct cognitive guises, making them semantically non-interchangeable in intensional contexts.
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3.If sentences (17) and (18) involve propositional attitude reports, substituting co-referring names can alter truth conditions, proving a meaning difference.
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Reason against 2 of 2

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