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6 ideas
5. Theory of Logic / B. Logical Consequence / 5. Modus Ponens
8078
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Modus ponens is one of five inference rules identified by the Stoics [Chrysippus, by Devlin]
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5. Theory of Logic / D. Assumptions for Logic / 2. Excluded Middle
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Every proposition is either true or false [Chrysippus, by Cicero]
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Excluded middle is the maxim of definite understanding, but just produces contradictions [Hegel]
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5. Theory of Logic / L. Paradox / 3. Antinomies
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The idea that contradiction is essential to rational understanding is a key modern idea [Hegel]
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Tenderness for the world solves the antinomies; contradiction is in our reason, not in the essence of the world [Hegel]
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Antinomies are not just in four objects, but in all objects, all representations, all objects and all ideas [Hegel]
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