A thirteenth century 'proof' of the parallel postulate

Sabetai Unguru*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


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.

Original languageEnglish
Pages (from-to)205-210
Number of pages6
JournalHistoria Mathematica
Issue number2
StatePublished - May 1978
Externally publishedYes


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