Combining Texts
Ideas for
'Axiomatic Theories of Truth', 'Four Dimensionalism' and 'Introduction to the Philosophy of Mathematics'
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5 ideas
4. Formal Logic / E. Nonclassical Logics / 2. Intuitionist Logic
17926
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Rejecting double negation elimination undermines reductio proofs [Colyvan]
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Showing a disproof is impossible is not a proof, so don't eliminate double negation [Colyvan]
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4. Formal Logic / E. Nonclassical Logics / 3. Many-Valued Logic
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In Strong Kleene logic a disjunction just needs one disjunct to be true [Halbach]
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In Weak Kleene logic there are 'gaps', neither true nor false if one component lacks a truth value [Halbach]
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4. Formal Logic / F. Set Theory ST / 1. Set Theory
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Every attempt at formal rigour uses some set theory [Halbach]
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