Combining Philosophers
Ideas for Hermarchus, Anjan Chakravarrty and Ian Rumfitt
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6 ideas
10. Modality / A. Necessity / 3. Types of Necessity
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A distinctive type of necessity is found in logical consequence [Rumfitt, by Hale/Hoffmann,A]
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10. Modality / A. Necessity / 5. Metaphysical Necessity
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Metaphysical modalities respect the actual identities of things [Rumfitt]
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10. Modality / A. Necessity / 6. Logical Necessity
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Logical necessity is when 'necessarily A' implies 'not-A is contradictory' [Rumfitt]
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A logically necessary statement need not be a priori, as it could be unknowable [Rumfitt]
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12202
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Narrow non-modal logical necessity may be metaphysical, but real logical necessity is not [Rumfitt]
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18825
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S5 is the logic of logical necessity [Rumfitt]
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