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'Croce and Collingwood', 'Foundations of Philosophical Knowledge' and 'Introduction to the Philosophy of Mathematics'
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2 ideas
4. Formal Logic / E. Nonclassical Logics / 2. Intuitionist Logic
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Showing a disproof is impossible is not a proof, so don't eliminate double negation [Colyvan]
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Rejecting double negation elimination undermines reductio proofs [Colyvan]
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