Combining Philosophers
Ideas for Rescher,N/Oppenheim,P, Nathan Salmon and Jonathan Swift
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8 ideas
10. Modality / A. Necessity / 3. Types of Necessity
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14680
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Logical possibility contains metaphysical possibility, which contains nomological possibility [Salmon,N]
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10. Modality / A. Necessity / 5. Metaphysical Necessity
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14690
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In the S5 account, nested modalities may be unseen, but they are still there [Salmon,N]
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14677
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Metaphysical necessity is said to be unrestricted necessity, true in every world whatsoever [Salmon,N]
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14679
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Bizarre identities are logically but not metaphysically possible, so metaphysical modality is restricted [Salmon,N]
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14688
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Without impossible worlds, the unrestricted modality that is metaphysical has S5 logic [Salmon,N]
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14685
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Metaphysical necessity is NOT truth in all (unrestricted) worlds; necessity comes first, and is restricted [Salmon,N]
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10. Modality / A. Necessity / 6. Logical Necessity
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14681
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Logical necessity is free of constraints, and may accommodate all of S5 logic [Salmon,N]
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10. Modality / A. Necessity / 7. Natural Necessity
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14676
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Nomological necessity is expressed with intransitive relations in modal semantics [Salmon,N]
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