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Non-rigidness/Non-rigid/predicate/Stalnaker: non-rigid predicates: correspond to different intrinsic properties in various possible worlds.
Rigidness/Stalnaker: Does it presuppose cross world identity?.
Dthis/Dthat/Kaplan/Rigid-making operator/Stalnaker: (Kaplan 1978): always refers the object back to the actual world. - (make rigid) - The reference is then in each possible world the original from the real world.
E.g. Julius/Zipper/Evans/Stalnaker: can be interpreted in two ways: a) as abbreviation of a complex singular term dthis [the inventor of the zipper], then the inventor of the zipper is part of the meaning. - And it’s a logical truth that he invented it - b) as a definition: that Julius is the name of a person. - Then it would be a semantic one. ((s) not logical connection) between the name and person. - Then the role of the description, the reference would have to be defined. - E.g. someone catches the name: case a) then he does not understand the statement. - Then dthis [the person to whom Stalnaker referred on the occasion]. - Ad b) if the semantic properties of Julius are part of the historical causal chain, the competent speaker needs to know nothing about it.
Ways a World may be Oxford New York 2003