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