Ideas from 'Morals and Modals' by Simon Blackburn , by Theme Structure
[found in 'Metaphysics - An Anthology' (ed/tr Sosa,E. /Kim,J.) [Blackwell 1999,0-631-20279-x]].
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10. Modality / C. Sources of Modality / 1. Sources of Necessity
If we are told the source of necessity, this seems to be a regress if the source is not already necessary
If something underlies a necessity, is that underlying thing necessary or contingent?