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Ideas for 'fragments/reports', 'How to Russell a Frege-Church' and 'Investigations into Logical Deduction'

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5. Theory of Logic / F. Referring in Logic / 2. Descriptions / c. Theory of definite descriptions

11989

For Russell, expressions dependent on contingent circumstances must be eliminated [Kaplan]

5. Theory of Logic / H. Proof Systems / 4. Natural Deduction

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Natural deduction shows the heart of reasoning (and sequent calculus is just a tool) [Gentzen, by Hacking]