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Ideas for 'Essays on Intellectual Powers: Conception', 'works' and 'Lectures 1930-32 (student notes)'

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2 ideas

10. Modality / C. Sources of Modality / 3. Necessity by Convention

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For each necessity in the world there is an arbitrary rule of language [Wittgenstein]

10. Modality / D. Knowledge of Modality / 4. Conceivable as Possible / b. Conceivable but impossible

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Impossibilites are easily conceived in mathematics and geometry [Reid, by Molnar]