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|Frank I 22
Now/PerryVsFrege: "today" is not a completing or "saturating" sense, absolutely no sense, but a reference object - meaning remains, reference varies.
Frank I 394f
Today/Meaning: is constant, - however, the truth value of index word "today it is beautiful": is not constant, so the meaning is changing. - If understanding is knowing the truth value. - Perry: the role (the determination method) changes, the meaning remains constant. - Then, the meaning cannot be a part of the thought. - What the speaker thinks is irrelevant to the meaning of the index word.
J. R. Perry
Identity, Personal Identity, and the Self 2002
M. Frank (Hrsg.)
Analytische Theorien des Selbstbewusstseins Frankfurt 1994