8460
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Philosophers have given precise senses to deduction, probability, computability etc [Quine/Ullian]
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Full Idea:
Successful explications (giving a precise sense to a term) have been found for the concepts of deduction, probability and computability, to name just three.
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From:
W Quine / J Ullian (The Web of Belief [1970], 65), quoted by Alex Orenstein - W.V. Quine Ch.3
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A reaction:
Quine also cites the concept of an 'ordered pair'. Orenstein adds Tarski's definition of truth, Russell's definite descriptions, and the explication of existence in terms of quantifications. Cf. Idea 2958.
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3238
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'Dead person' isn't a contradiction, so 'person' is somewhat vague [Williams,B]
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Full Idea:
If we say (in opposition to a physical view of identity) that when Jones dies 'Jones ceases to exist' but 'Jones' body does not cease to exist', this shouldn't be pressed too hard, because it would make 'dead person' a contradiction.
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From:
Bernard Williams (Are Persons Bodies? [1970], p.74)
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A reaction:
A good point, which nicely challenges the distinction between a 'human' and a 'person', but the problem case is much more the one where Jones gets advanced Alzheimer's, rather than dies. A dead body ceases as a mechanism, as well as as a personality.
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3239
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You can only really love a person as a token, not as a type [Williams,B]
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Full Idea:
If you love a person as a type instead of as a token (i.e. a "person", instead of a physical body) you might prefer a run-down copy of them to no person at all, but at this point our idea of loving a person begins to crack.
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From:
Bernard Williams (Are Persons Bodies? [1970], p.81)
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A reaction:
Very persuasive. If you love a person you can cope with them getting old. If you own an original watercolour, you can accept that it fades, but you would replace a reproduction of it if that faded. But what, then, is it that you love?
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