Combining Texts
Ideas for
'Concerning the Author', 'The Metaphysics of Modality' and 'Rationality and Logic'
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5 ideas
10. Modality / A. Necessity / 2. Nature of Necessity
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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 / 4. De re / De dicto modality
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De re modal formulae, unlike de dicto, are sensitive to transworld identities [Forbes,G]
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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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