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Ideas for
'Locke on Human Understanding', 'Gentzen's Analysis of First-Order Proofs' and 'Hat-Tricks and Heaps'
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4 ideas
5. Theory of Logic / A. Overview of Logic / 1. Overview of Logic
13831
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Logic is based on transitions between sentences [Prawitz]
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5. Theory of Logic / E. Structures of Logic / 2. Logical Connectives / a. Logical connectives
13825
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Natural deduction introduction rules may represent 'definitions' of logical connectives [Prawitz]
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5. Theory of Logic / H. Proof Systems / 4. Natural Deduction
13823
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In natural deduction, inferences are atomic steps involving just one logical constant [Prawitz]
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5. Theory of Logic / L. Paradox / 6. Paradoxes in Language / b. The Heap paradox ('Sorites')
9117
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The smallest heap has four objects: three on the bottom, one on the top [Hart,WD, by Sorensen]
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