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Ideas for 'fragments/reports', 'Russell's Mathematical Logic' and 'On the Source of Necessity'

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4. Formal Logic / D. Modal Logic ML / 3. Modal Logic Systems / g. System S4

15102

S4 says there must be some necessary truths (the actual ones, of which there is at least one) [Cameron]

4. Formal Logic / F. Set Theory ST / 4. Axioms for Sets / p. Axiom of Reducibility

21716

In simple type theory the axiom of Separation is better than Reducibility [Gödel, by Linsky,B]