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2 ideas
5. Theory of Logic / A. Overview of Logic / 2. History of Logic
11022
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Gentzen introduced a natural deduction calculus (NK) in 1934 [Gentzen, by Read]
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5. Theory of Logic / A. Overview of Logic / 3. Value of Logic
16728
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Logicians acknowledge too few things, while others acknowledge too many [Fitzralph]
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