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Ideas for 'fragments/reports', 'Philosophy of Logic' and 'Which Logic is the Right Logic?'

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4. Formal Logic / F. Set Theory ST / 3. Types of Set / a. Types of set

18958

In type theory, 'x ∈ y' is well defined only if x and y are of the appropriate type [Putnam]

4. Formal Logic / F. Set Theory ST / 4. Axioms for Sets / j. Axiom of Choice IX

10775

The axiom of choice now seems acceptable and obvious (if it is meaningful) [Tharp]