Combining Texts
Ideas for
'The Philosophy of Philosophy', 'Rationality and Logic' and 'On the Conservation of Force'
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7 ideas
10. Modality / A. Necessity / 2. Nature of Necessity
11083
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A sentence is necessary if it is true in a set of worlds, and nonfalse in the other worlds [Hanna]
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10. Modality / A. Necessity / 5. Metaphysical Necessity
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Metaphysical necessity can be 'weak' (same as logical) and 'strong' (based on essences) [Hanna]
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10. Modality / A. Necessity / 6. Logical Necessity
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Logical necessity is truth in all logically possible worlds, because of laws and concepts [Hanna]
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10. Modality / A. Necessity / 7. Natural Necessity
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Nomological necessity is truth in all logically possible worlds with our laws [Hanna]
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10. Modality / D. Knowledge of Modality / 1. A Priori Necessary
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Modal thinking isn't a special intuition; it is part of ordinary counterfactual thinking [Williamson]
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10. Modality / D. Knowledge of Modality / 4. Conceivable as Possible / a. Conceivable as possible
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Williamson can't base metaphysical necessity on the psychology of causal counterfactuals [Lowe on Williamson]
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9596
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We scorn imagination as a test of possibility, forgetting its role in counterfactuals [Williamson]
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