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8375 | 'Necessary' is a predicate of a propositional function, saying it is true for all values of its argument [Russell] |
14629 | If we are told the source of necessity, this seems to be a regress if the source is not already necessary [Blackburn] |
14529 | If something underlies a necessity, is that underlying thing necessary or contingent? [Blackburn, by Hale/Hoffmann,A] |