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Ideas for 'Introduction to Russell's Theory of Types', 'Mechanisms' and 'Intro to 'Philosophy of Logic''

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4. Formal Logic / D. Modal Logic ML / 3. Modal Logic Systems / a. Systems of modal logic

9456	Modal logic is multiple systems, shown in the variety of accessibility relations between worlds [Jacquette]

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

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The Axiom of Reducibility is self-effacing: if true, it isn't needed [Quine]