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Diagrams have been rightly acknowledged to license inferences in Euclid's geometric practice. However, if on one hand purely visual proofs are to be found nowhere in the Elements, on the other, fully fledged proofs of diagrammatically evident statements are offered, as in El. I. 20: 'In any triangle the sum of two sides is greater than the third'. In this paper the author explains, taking as a starting...
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