15101
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Once you give up necessity as a priori, causal necessity becomes the main type of necessity [Shoemaker]
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Full Idea:
Once the obstacle of the deeply rooted conviction that necessary truths should be knowable a priori is removed, ...causal necessity is (pretheoretically) the very paradigm of necessity, in ordinary usage and in dictionaries.
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From:
Sydney Shoemaker (Causal and Metaphysical Necessity [1998], VII)
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A reaction:
The a priori route seems to lead to logical necessity, just by doing a priori logic, and also to metaphysical necessity, by some sort of intuitive vision. This is a powerful idea of Shoemaker's (implied, of course, in Kripke).
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17703
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Light in straight lines is contingent a priori; stipulated as straight, because they happen to be so [Mares]
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Full Idea:
It seems natural to claim that light rays moving in straight lines is contingent but a priori. Scientists stipulate that they are the standard by which we measure straightness, but their appropriateness for this task is a contingent feature of the world.
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From:
Edwin D. Mares (A Priori [2011], 02.9)
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A reaction:
This resembles the metre rule in Paris. It is contingent that something is a certain way, so we make being that way a conventional truth, which can therefore be known via the convention, rather than via the contingent fact.
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15100
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Imagination reveals conceptual possibility, where descriptions avoid contradiction or incoherence [Shoemaker]
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Full Idea:
Imaginability can give us access to conceptual possibility, when we come to believe situations to be conceptually possible by reflecting on their descriptions and seeing no contradiction or incoherence.
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From:
Sydney Shoemaker (Causal and Metaphysical Necessity [1998], VI)
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A reaction:
If take the absence of contradiction to indicate 'logical' possibility, but the absence of incoherence is more interesting, even if it is a bit vague. He is talking of 'situations', which I take to be features of reality. A priori synthetic?
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