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A thirteenth century ‘proof’ of the parallel postulate |
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| Authors: | Sabetai Unguru |
| Institution: | University of Oklahoma, Norman, OK 73019 USA |
| Abstract: | Proposition I.14 of Witelo's Perspectiva purports to provide a proof of the claim contained in Euclid's fifth postulate. The Latin text of the proposition is presented and translated into English; a commentary on the nature of the ‘proof’ is also provided. |
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