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All the ideas for 'works (all lost)', 'Necessary Truth' and 'Anselm and Actuality'
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4. Formal Logic / D. Modal Logic ML / 4. Alethic Modal Logic
16456
For modality Lewis rejected boxes and diamonds, preferring worlds, and an index for the actual one
[Lewis, by Stalnaker]
10. Modality / A. Necessity / 11. Denial of Necessity
4577
There is no necessity higher than natural necessity, and that is just regularity
[Quine]