Grice on "individual-constant variant" Z' of interpretation Z

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From Grice, p. 136, in Davidson/Hintikka:

"An interpretation Z' is an individual-constant-variant of Z iff Z' differs from Z (if at all) only in that, for at least ONE individual constant a, the correlatum of a in Z' is different from the correlatum of a in Z".

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Following Mates, Grice stipulates that

"Ewnphi is corr(1) on Z iff phi(a'/w) is corr(1) on at least one individual-constant-variant of Z, where a' is the FIRST individual constant in [G]."

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