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Name / non-rigid / FieldVs: assume, names would be considered as non-rigid. Then: to believe that Russell was bald, you have to believe a sentence that contains an identifier of Russell "F" and "G" stands for baldness - a sentence of the form ("G (ixFx)" - N.B.: why should we introduce possible worlds - and propositions together with them? - assuming propositions and explains them with worlds - and then wants to distinguish between propositions, then one has to accept names and expressions such as "temperature" as a non-rigid.
Realism, Mathematics and Modality Oxford New York 1989
Truth and the Absence of Fact Oxford New York 2001
Science without numbers Princeton New Jersey 1980