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Full Idea
Among the proposals for conditions under which two sentences have the same ordinary sense, the most liberal (Carnap and Church) is that they be logically equivalent, and the most restrictive (Benson Mates) is that they never have the same sense.
Gist of Idea
Sentences might have the same sense when logically equivalent - or never have the same sense
Source
David Kaplan (Transworld Heir Lines [1967], p.89)
Book Ref
'The Possible and the Actual', ed/tr. Loux,Michael J. [Cornell 1979], p.89
A Reaction
Personally I would move the discussion to the level of the propositions being expressed before I attempted a solution.
| 9009 | Single words are strongly synonymous if their interchange preserves truth [Quine] |
| 7317 | 'Renate' and 'cordate' have identical extensions, but are not synonymous [Quine, by Miller,A] |
| 7319 | If we give up synonymy, we have to give up significance, meaning and sense [Grice/Strawson] |
| 3090 | There is only similarity in meaning, never sameness in meaning [Harman] |
| 11967 | Sentences might have the same sense when logically equivalent - or never have the same sense [Kaplan] |
| 2996 | Mental states may have the same content but different extensions [Fodor] |
| 20300 | Externalist synonymy is there being a correct link to the same external phenomena [Rey] |
| 9372 | Could expressions have meaning, without two expressions possibly meaning the same? [Boghossian] |