Combining Texts
Ideas for
'Through the Looking Glass', 'The Sceptical Chemist' and 'Posterior Analytics'
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4 ideas
5. Theory of Logic / A. Overview of Logic / 6. Classical Logic
12376
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Demonstrations by reductio assume excluded middle [Aristotle]
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5. Theory of Logic / B. Logical Consequence / 1. Logical Consequence
12373
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Something holds universally when it is proved of an arbitrary and primitive case [Aristotle]
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5. Theory of Logic / D. Assumptions for Logic / 2. Excluded Middle
12363
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Everything is either asserted or denied truly [Aristotle]
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5. Theory of Logic / K. Features of Logics / 1. Axiomatisation
13004
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Aristotle's axioms (unlike Euclid's) are assumptions awaiting proof [Aristotle, by Leibniz]
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