Ideas from 'The Source of Necessity' by Bob Hale [2002], by Theme Structure

[found in 'Philosophical Perspectives' (ed/tr -) [- ,]].

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10. Modality / C. Sources of Modality / 1. Sources of Necessity
Explanation of necessity must rest on something necessary or something contingent
Why is this necessary, and what is necessity in general; why is this necessary truth true, and why necessary?
The explanation of a necessity can be by a truth (which may only happen to be a necessary truth)
10. Modality / C. Sources of Modality / 3. Necessity by Convention
If necessity rests on linguistic conventions, those are contingent, so there is no necessity
10. Modality / C. Sources of Modality / 4. Necessity from Concepts
Concept-identities explain how we know necessities, not why they are necessary