Combining Texts
Ideas for
'The Evolution of Modern Metaphysics', 'Philosophical Logic' and 'What is a Law of Nature?'
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2 ideas
5. Theory of Logic / I. Semantics of Logic / 3. Logical Truth
15408
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'Tautologies' are valid formulas of classical sentential logic - or substitution instances in other logics [Burgess]
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5. Theory of Logic / I. Semantics of Logic / 4. Satisfaction
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Validity (for truth) and demonstrability (for proof) have correlates in satisfiability and consistency [Burgess]
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