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'Frege's Concept of Numbers as Objects', 'Commentary on Euclid's 'Elements'' and 'Essays on Intellectual Powers 4: Conception'
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10. Modality / D. Knowledge of Modality / 4. Conceivable as Possible / b. Conceivable but impossible
11958
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Impossibilites are easily conceived in mathematics and geometry [Reid, by Molnar]
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