Not really a deductive system?
By now people realize that the Elements are not really a deductive system, and indeed were not intended to be one. Ineed? Since this contradicts the opening paragraph, "Euclid's Elements constitute a typical deductive system" I think a rather authoritative reference is required. Richard Pinch (talk) 21:37, 26 November 2016 (CET)
Elements-of-Euclid. Encyclopedia of Mathematics. URL: http://encyclopediaofmath.org/index.php?title=Elements-of-Euclid&oldid=39832