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Quotation marks/quotation/Davidson/Millikan: (D. Davidson Quotation, 1979) thesis: mentioning quotation marks are indexical or "demonstrative". Their filling is semantically outside the sentence. Just like when I point at a fish and say "I caught this fish" the fish lies outside the sentence.
Mentioning quotation marks/Davidson: something like e.g. "the expression with the form shown here".
MillikanVsDavidson: Suppose the quotation marks alone get the indexing. Then the indexical matching relation is a relation to a type of filling ((s) the content does not matter).
But if the filling is considered as part of the sentence, then the question is what is the criterion for where the sentence ends and where the environment of the sentence begins? E.g. "I caught this fish today" is a complete sentence with and without fish. On the other hand, ""___" has five letters" is not a complete sentence.
((s) The demonstrative therefore needs not to be fulfilled in the sentence, but can be supplemented by ostension, but the filling of quotation marks is indispensable in the sentence.
Quotation marks/Davidson/Millikan: thesis: Quotation marks refer to the form of the expression (filling) between them.
MillikanVsDavidson: that is inadequate because you have no clear concept of an expression type. Expressions are never categorized by the form.
Millikan: Thesis: a strength of my approach is that linguistic units can be grouped into types. But this is not about form, but about the lowest types or genetic families.
Millikan: when we say "he first drew this ... and then that...", we need demonstratives and ostension, not quotation marks.
R. G. Millikan
Language, Thought, and Other Biological Categories: New Foundations for Realism Cambridge 1987