词条 | Non-rigid designator |
释义 |
ExamplesAs an example, consider the phrase "The 43rd President of the United States of America": while the 43rd President of the United States is actually George W. Bush, things might have been different. Bush might have lost the election, meaning that the 43rd President might have been Al Gore or Ralph Nader instead. (How remote these possible worlds are from the actual world is a discussion for physics and counterfactualism.) "The 43rd President of the United States of America" is thus a non-rigid designator, picking out George W. Bush in some possible worlds, Al Gore in others, and yet other people in other worlds. Non-rigid designators are defined by contrast with Kripke's notion of a rigid designator, which picks out the same thing uniquely in every possible world; while there are possible worlds in which the 43rd President of the United States is Al Gore instead of George W. Bush, there are no possible worlds where George W. Bush is anyone other than the man who, in fact, he is. (There are worlds where some person other than George W. Bush is named "George W. Bush," but that's neither here nor there.) Kripke uses this apparent asymmetry to argue (in Naming and Necessity) that no definite description can be the meaning of a proper name, because names must always be rigid designators, while definite descriptions can designate non-rigidly. CriticismSome philosophers, such as Gareth Evans, have expressed doubt as to whether non-rigid expressions ought to be called designators at all.[3] References1. ^{{cite book |title=Oxford Dictionary of Philosophy, Revised Second Edition |year=2008 |page=318}} {{DEFAULTSORT:Non-Rigid Designator}}2. ^{{cite book |title=Naming and Necessity |year=1980 |last=Kripke |first=Saul |publisher=Harvard University Press|page=22 }} 3. ^{{cite book |title=The Varieties of Reference |year=1982 |last=Evans |first=Gareth |publisher=Oxford University Press }} 4 : Concepts in logic|Modal logic|Philosophy of language|Names |
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