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Ideas for 'Knowledge, Possibility and Consciousness', 'Introduction: Truth and Truth-Making' and 'Philosophy of Logic'

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2 ideas

4. Formal Logic / B. Propositional Logic PL / 2. Tools of Propositional Logic / e. Axioms of PL

9013	We can eliminate 'or' from our basic theory, by paraphrasing 'p or q' as 'not(not-p and not-q)' [Quine]

4. Formal Logic / D. Modal Logic ML / 7. Barcan Formula

18350

Truth-maker theorists should probably reject the converse Barcan formula [Rami]